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{{Testcases}}
__TOC__


==Proposal: add parameter checks==
:-12:26, 6 March 2023 (UTC)
* {{ProposalOnHold}}
:Waiting for {{slink|Template_talk:Chem2|Must_preserve_minus_signs_in_subscripts to be finished}} -[[User:DePiep|DePiep]] ([[User talk:DePiep|talk]]) 09:24, 28 February 2023 (UTC)
:See talk {{slink|Template_talk:Chem2|Proposal: add parameter checks}}
:Prepared in {{tl|Chem2/sandbox2}}. -[[User:DePiep|DePiep]] ([[User talk:DePiep|talk]]) 09:24, 28 February 2023 (UTC)
;Tests (also by {{button|Preview}}):
*Example, by /sandbox2:
::<code><nowiki>{{chem2/sandbox2|foo=H2O|1=A_{x}H_{1-x}}}</nowiki></code>
: &rarr; {{chem2/sandbox2|foo=H2O|1=A_{x}H_{1-x}}}

::to check (negative check expected): "A{B{Q}" -- error all right, but for other reason (unbalanced, & end-bracket). Effect is OK.
: &rarr; {{chem2/sandbox2|1=A{B{Q}|2=}}
: &rarr; {{chem2/sandbox2|1=A{B|2=}}
:pattern: >{{#invoke:String|match|s=A{B{Q}|pattern=(%{[^%}]*)$|plain=false|ignore_errors=true|nomatch=}}<
::-[[User:DePiep|DePiep]] ([[User talk:DePiep|talk]]) 05:49, 1 March 2023 (UTC)

==subscript hyphen (Feb 2023)==
:-[[User:DePiep|DePiep]] ([[User talk:DePiep|talk]]) 19:47, 27 February 2023 (UTC)
*Issue: {{slink|Template_talk:Chem2|Must_preserve_minus_signs_in_subscripts}}
:{{tl|Chem2/sandbox}} initially: now has [[:Module:Chem2/sandbox]] (from live source code).
:Template styles: [[:Module:Chem2/styles.css]]  (Chem2/sandbox/styles.css [https://en.wikipedia.org/wiki/Special:ComparePages?page1=Module%3AChem2%2Fstyles.css&rev1=&page2=Module%3AChem2%2Fsandbox%2Fstyles.css&rev2=&action=&unhide=&diffmode=source diff])

:Bug reproduction:
::(A) code: <code><nowiki>{{chem2|A_{''x''}H_{1-''x''}|}}</nowiki></code> &rarr; {{chem2|A_{''x''}H_{1-''x''}|}} (current live result) 
::Hardcoded result from expanded live template (19:36, 27 February 2023): <templatestyles src="Module:Chem2/styles.css"/><span class="chemf nowrap">A<sub class="template-chem2-sub">''x''</sub>H<sub class="template-chem2-sub">1-''x''</sub></span>
::(B, {chem2/sandbox} live): {{chem2/sandbox|A_{''x''}H_{1-''x''}|}}
::Characters involved: 
::(H) {{unichar|002d|HYPHEN-MINUS|html=}} &rarr; {{chem2|1=A_{''x''}H_{1-''x''}|2=}}
::(M) {{unichar|2212|MINUS SIGN|html=}} &rarr; {{chem2|1=A_{''x''}M_{1−''x''}|2=}}

* Done /sandbox: L239, % not \ (tot test; errors from live code?)
: L250, L251

*what's with \s, \-
* whatwhen entering &amp;minus; ?
===tests===
* [[:Module:Chem2]], [[:Module:Chem2/sandbox]] ({{diffsandbox|Module:Chem2}})
::tst setup: <code><nowiki> {{chem2|1=A^{1-''y''}B_{1-''x''}H|2=}}</nowiki></code> (H, M)
::test minus M>−< vs, hyphen H>-<:
::{{mono|1=live, in:H>-<:}} {{chem2|1=A^{1-''y''}B_{1-''x''}H(2-)}}
::{{mono|1=/sbx, in:H>-<:}} {{chem2/sandbox|1=A^{1-''y''}B_{1-''x''}H(2-)}}
::{{mono|1=live, in:M>−<:}} {{chem2|1=A^{1−''y''}B_{1−''x''}M(2−)}}
::{{mono|1=/sbx, in:M>−<:}} {{chem2/sandbox|1=A^{1−''y''}B_{1−''x''}M(2−)}}
:::''All'' sup/sub returns (8) are U+002d hyphen {{nay}}
:::All (4) 2- charge returnsa are U+2212 {{aye}}
::-[[User:DePiep|DePiep]] ([[User talk:DePiep|talk]]) 20:36, 27 February 2023 (UTC)

*Entering {{code|1=&minus;}}
:{{mono|1=live, in:>&amp;minus;<:}} {{chem2|1=A^{1&minus;''y''}B_{1&minus;''x''}M(2&minus;)}} -- incidentally, returns as expected .. 
:{{mono|1=/sbx, in:>&amp;minus;<:}} {{chem2/sandbox|1=A^{1&minus;''y''}B_{1&minus;''x''}M(2&minus;)}}


:Entering {{code|1=&beta;}}
:{{mono|1=live, in:>&amp;beta;<:}} {{chem2|1=A^{1&beta;''y''}B_{1&beta;''x''}M(2&beta;)}} 
:{{mono|1=/sbx, in:>&amp;beta;<:}} {{chem2/sandbox|1=A^{1&beta;''y''}B_{1&beta;''x''}M(2&beta;)}}


*lol from doc: use \s, \-
::{{mono|1=live, in:H>\-<:}} {{chem2|1=A^{1\-''y''}B_{1\-''x''}H(2\-)}}
::{{mono|1=/sbx, in:H>\-<:}} {{chem2/sandbox|1=A^{1\-''y''}B_{1\-''x''}H(2\-)}}
::{{mono|1=live, in:M>\s<:}} {{chem2|1=A^{1\s''y''}B_{1\s''x''}M(2\s)}}
::{{mono|1=/sbx, in:M>\s<:}} {{chem2/sandbox|1=A^{1\s''y''}B_{1\s''x''}M(2\s)}}

==talk: Must preserve minus signs in subscripts ==
{{hatnote |full c/p as of [[User:DePiep|DePiep]] ([[User talk:DePiep|talk]]) 06:44, 28 February 2023 (UTC)}}
===talk: debugging & tests===
:see /testcases at {{slink|Template:Chem2/testcases#subscript_hyphen_(Feb_2023)|nopage=yes}}
*More research: 
::Test string to be  (rule: when final-{{hl|1=}<nowiki/>}} in formula input, end pipe {{hl|1=<nowiki>}|}}</nowiki>}} is required):
::(A) <code><nowiki>{{chem2|A_{''x''}H_{1-''x''}|}}</nowiki></code> &rarr; {{chem2|A_{''x''}H_{1-''x''}|}}
::Characters involved: 
::(H) {{unichar|002d|HYPHEN-MINUS|html=}} &rarr; {{chem2|1=A_{''x''}H_{1-''x''}|2=}}
::(M) {{unichar|2212|MINUS SIGN|html=}} &rarr; {{chem2|1=A_{''x''}M_{1−''x''}|2=}}
::re MSGJ: by reading the code, none of the lines 277 (good replacement), 288 (good replacement), 294 (hyphen only) seem to make the ''wrong'' replacement. 
::-[[User:DePiep|DePiep]] ([[User talk:DePiep|talk]]) 19:02, 27 February 2023 (UTC)
:::code review: 
:::* L239 (current live): <code>if not x  then x = f:match('^\^{[^}]*}', i); t = T_CARET; end   -- ^{...}</code>
:::{{code|1=^\^{[^}]*}|2=}} ? expected {{code|1=^^{[^}]*}|2=}} (Lua pattern not regex; module preview reports {{mono|1=Error: [239:42] invalid escape sequence near '\^'}}. (Errors from this, missed? hidden?) [https://en.wikipedia.org/w/index.php?title=Module:Chem2/sandbox&diff=prev&oldid=1141962955 edited in sandbox][[User:DePiep|DePiep]] ([[User talk:DePiep|talk]]) 19:57, 27 February 2023 (UTC)
* test code to be:
::<code><nowiki>{{chem2|1=A^{1-''y''}B_{1-''x''}H(2-)}}</nowiki></code>
::Three minus/hyphen signs input, ''expected result'': all three Minus (M). Current live test: 
::{{mono|1=Live M>−<:}} {{chem2|1=A^{1−''y''}B_{1−''x''}M(2−)}}
::returns H, H, M. sup/sub issue. -[[User:DePiep|DePiep]] ([[User talk:DePiep|talk]]) 20:43, 27 February 2023 (UTC)

====talk: Bug report====
*See /testcases at {{slink|Template:Chem2/testcases#subscript_hyphen_(Feb_2023)|nopage=yes}}. [[:module:Chem2]], [https://en.wikipedia.org/w/index.php?title=Module:Chem2&oldid=1064523403 current live code]. 
::(H) {{unichar|002d|HYPHEN-MINUS|html=}}<!-- H>-<  -->
::(M) {{unichar|2212|MINUS SIGN|html=}}<!--   M>−<  -->
'''From original report''' (OP); {{code|1=B2-B}} (demo/test inline) and {{code|1=(4-)}} (charge) added as extra testcases (situations 1&ndash;4 now).
:''In the tests here, {{code|1=B2-B}} is added and is not targeted'' (no changes claimed nor expected; ignored in conclsions)
::<code><nowiki>{{chem2|1=HA^{''1-x''}B2-B_{3-''x''}(4-)}}</nowiki></code>
::<code><nowiki>{{</nowiki>chem2|1=HA^<nowiki>{</nowiki>{{hl|1-}}''x''}B{{hl|2-}}B_<nowiki>{</nowiki>{{hl|3-}}''x''}({{hl|4-}})}}</code>
::{{mono|1=in H>-<:}} {{chem2|1=HA^{''1-x''}B2-B_{3-''x''}(4-)}} -- {{nay}} MINUS expected
::{{mono|1=in M>−<:}} {{chem2|1=MA^{''1−x''}B2−B_{3−''x''}(4−)}} -- {{nay}} MINUS expected
;'''(A)''' Original complaint:
:MINUS (−) not kept when in (topically correct) sub/supscripted formula is entered; shows hyphen (-) instead.
:Cause: {{tlf|Chem2}} early replaces NDASH and MINUS with HYPHEN, to be treatred similar (see code L250, 251).
:When as charge, the hyphen is changed into MINUS all right, but no such replacement in the supsubscripts.
:''Proposed solution'': in T_CARET and T_UNDERSCORE change any hyphen (from early replacement) into MINUS [https://en.wikipedia.org/w/index.php?title=Module:Chem2/sandbox&diff=prev&oldid=1141993325].
::{{mono|1=live, in:H>-<:}} {{chem2|1=HA^{''1-x''}B2-B_{3-''x''}(4-)}}
::{{mono|1=/sbx, in:H>-<:}} {{chem2/sandbox|1=HA^{''1-x''}B2-B_{3-''x''}(4-)}}
::{{mono|1=live, in:M>−<:}} {{chem2|1=MA^{''1−x''}B2−B_{3−''x''}(4−)}}
::{{mono|1=/sbx, in:M>−<:}} {{chem2/sandbox|1=MA^{''1−x''}B2−B_{3−''x''}(4−)}}
::Showing: current live version returns HYPHEN in subsuptexts; correct MINUS inline and in the "(2-)" charge). All irrespective of input character.

;'''(B)''' Handling of HTML entities {{mono|1=(&amp;minus;)}}
:When entering like {{code|&minus;}} (for character MINUS), it is ''not'' handled as the character.
:Incidentally, this ''preserves'' the MINUS character as asked for in the OP (undocumented 'solution', hack).
:However, not documented and would give different results between input {{code|&minus;}} vs. {{code|1=−}}. Also, other codes entries could be affected.
:''Proposed solution'': add early decoding  {{code|1=mw.text.decode()}} [https://en.wikipedia.org/w/index.php?title=Module:Chem2/sandbox&diff=prev&oldid=1141991294].
*Entering HTML Entity {{code|1=&minus;}}
::{{mono|1=live, in:>&amp;minus;<:}} {{chem2|1=EA^{''1&minus;x''}B2&minus;B_{3&minus;''x''}(4&minus;)}} -- incidentally, returns as expected
::{{mono|1=/sbx, in:>&amp;minus;<:}} {{chem2/sandbox|1=EA^{''1&minus;x''}B2&minus;B_{3&minus;''x''}(4&minus;)}}
:Entering {{code|1=&beta;}}
:{{mono|1=live, in:>&amp;beta;<:}} {{chem2|1=EA^{''1&beta;x''}B2&beta;B_{3&beta;''x''}(4&beta;)}} -- as expected :{{mono|1=/sbx, in:>&amp;beta;<:}} {{chem2/sandbox|1=EA^{''1&beta;x''}B2&beta;B_{3&beta;''x''}(4&beta;)}} -- same result (returns decoded &amp;beta; to UA: decoded later)

;'''(C)''' Bad code
<syntaxhighlight lang="lua" highlight="1">
L239: if not x then x = f:match('^\^{[^}]*}', i); t = T_CARET; end   -- ^{...}
</syntaxhighlight>
:Parser gives error: {{code|1='^\^{[^}]*}'}} has incorrect "\" (note: expected is Lua pattern not Regex). Saves with error (-warning).
:No error effects (in pages) known, nor seen in testpage.
:From Lua documentation [[:mw:Extension:Scribunto/Lua_reference_manual#Patterns|mw:Lua manual]]: "At other positions, '^' and '$' have no special meaning and represent themselves". That is: the second caret should represent the input character (to indicate superscript).
:''Proposed solution:'' Remove the slash: [https://en.wikipedia.org/w/index.php?title=Module:Chem2/sandbox&diff=prev&oldid=1141976444]. No effects in tests seen.
:Testcases: see superscripts (CARET input) throughout.
::''Late note 29 March 2023'', from [[:mw:Extension:Scribunto/Lua_reference_manual#string|mw:Lua_reference_manual § string]]: the code {{code|1=\^}} is ''not'' required to escape the literal character in Lua code (as opposed to e.g., {{code|1=\"}}). <small>-[[User:DePiep|DePiep]] ([[User talk:DePiep|talk]]) 05:04, 29 March 2023 (UTC)</small>
;(D) Escape codes limitations
:The /documentation mentions {{code|\s}}, {{code|\-}} for input "single bond" (topical term) and "hyphen" when used in line. However, they don't work as expected when in sup/subscripted text (as in OP).
:''Proposed solution'': the escape codes are ''not'' developed to function more widely. Instead, documentation to be improved (mention limitations).
*From doc: use {{code|1=\s, \-}} slashed escape code (note: "B2-B" as expected)
::{{mono|1=live, in:>\s<:}} {{chem2|1=SsA^{''1\sx''}B2\sB_{3\s''x''}(4\s)}}
::{{mono|1=/sbx, in:>\s<:}} {{chem2/sandbox|1=SsA^{''1\sx''}B2\sB_{3\s''x''}(4\s)}}
::{{mono|1=live, in:>\-<:}} {{chem2|1=ShA^{''1\-''}B2\-B_{3\-''x''}(4\-)}}
::{{mono|1=/sbx, in:>\-<:}} {{chem2/sandbox|1=ShA^{''1\-''}B2\-B_{3\-''x''}(4\-)}}
:-[[User:DePiep|DePiep]] ([[User talk:DePiep|talk]]) 00:06, 28 February 2023 (UTC)

'''(T) more tests: bare hyphen''': input without no preceding number etc in text element (eg, charge "(-)"):
::{{chem2|1=HA^{''-x''}-B_{-''x''}(-)}}
::{{chem2/sandbox|1=HA^{''-x''}-B_{-''x''}(-)}}
::{{chem2|1=MA^{''−x''}−B_{−''x''}(−)}}
::{{chem2/sandbox|1=MA^{''−x''}−B_{−''x''}(−)}}
::{{chem2|1=EA^{''&minus;x''}&minus;B_{&minus;''x''}(&minus;)}} -- &amp;minus;
::{{chem2/sandbox|1=EA^{''&minus;x''}&minus;B_{&minus;''x''}(&minus;)}}
:Adjustmensts, refining testcases, spell uc MINUS etc, create 4 numberred testsituations [[User:DePiep|DePiep]] 05:41, 28 February 2023 
:For more bare "-" input tests (not "2-" &tc;), see /testcases (UTC), -[[User:DePiep|DePiep]] ([[User talk:DePiep|talk]]) 06:36, 28 February 2023 (UTC)

====(T2) added in /testcases====
'''(T2)''' more bare tests FWIW: rm italice, (), use {{code|1=\s \-}}
:live
::{{chem2|1=HA^{''-x''}-B_{-''x''}(-)}}
::{{chem2|1=MA^{-x}-B_{-x}-}}
::{{chem2|1=SsA^{''\sx''}\sB_{\s''x''}\s}}
::{{chem2|1=ShA^{''\-x''}\-B_{\-''x''}\-}}
::{{chem2|1=SsA^{''\sx''}\sB_{\s''x''}(\s)}}
::{{chem2|1=ShA^{''\-x''}\-B_{\-''x''}(\-)}}
:/sbox
::{{chem2/sandbox|1=HA^{''-x''}-B_{-''x''}(-)}}
::{{chem2/sandbox|1=MA^{-x}-B_{-x}-}}
::{{chem2/sandbox|1=SsA^{''\sx''}\sB_{\s''x''}\s}}
::{{chem2/sandbox|1=ShA^{''\-x''}\-B_{\-''x''}\-}}
::{{chem2/sandbox|1=SsA^{''\sx''}\sB_{\s''x''}(\s)}}
::{{chem2/sandbox|1=ShA^{''\-x''}\-B_{\-''x''}(\-)}}

====Proposal (code edit)====
:From the Report above, I propose to oconsider: edit all code from [[:module:Chem2/sandbox]] into [[:module:Chem2]] ({{diffsandbox|module:Chem2}}).
:Note: the (B) may change behaviour (instances relying on undocumented effects). Conservation action needed? OTOH, when ''entering'' &amp;minus;, what else should be expected than MINUS?
:Also, I'd like to have chemicist eyes taking a look.
:More tests at the [[:Template:Chem2/testcases]].
:-[[User:DePiep|DePiep]] ([[User talk:DePiep|talk]]) 00:06, 28 February 2023 (UTC)
:ping|Christian75|Mikhail Ryazanov|MSGJ demos and tests stable & ok now, please take a look. -[[User:DePiep|DePiep]] ([[User talk:DePiep|talk]]) 06:41, 28 February 2023 (UTC)

==doc input-code table (Feb 2023)==
===Formula punctuation (Chem2 live)===

{| class="wikitable"
|-
! Symbol
! Gives
! Example
! Output
|-
| <code>\s</code> || {{chem2|\s}} || <code><nowiki>{{chem2|CH3\sCH3}}</nowiki></code> || {{chem2|CH3\sCH3}}
|-
| <code>\d</code> || {{chem2|\d}} || <code><nowiki>{{chem2|CH2\dCH2}}</nowiki></code> || {{chem2|CH2\dCH2}}
|-
| <code>\t</code> || {{chem2|\t}}  || <code><nowiki>{{chem2|HC\tCH}}</nowiki></code> || {{chem2|HC\tCH}}
|-
| <code>\q</code> || {{chem2|\q}}  || <code><nowiki>{{chem2|[Cl4Re\qReCl4](2−)|}}</nowiki></code> || {{chem2|[Cl4Re\qReCl4](2−)|}}
|-
| <code>\-</code> || {{chem2|\-}} || <code><nowiki>{{chem2|A\-B}}</nowiki></code> || {{chem2|A\-B}}
|-
| <code>\\</code> || {{chem2|\\}} || <code><nowiki>{{chem2|C\\D}}</nowiki></code> || {{chem2|C\\D}}
|-
| <code>\h</code> || {{chem2|\h}} || <code><nowiki>{{chem2|\h}}</nowiki></code> || {{chem2|\h}}
|-
| <code>\h{1}</code> || {{chem2|\h{1}|}} || <code><nowiki>{{chem2|\h{1} |}}</nowiki></code> || {{chem2|\h{1}|}}
|-
| <code>\m{1}</code> || {{chem2|\m{1}|}} || <code><nowiki>{{chem2|\m{1} |}}</nowiki></code> || {{chem2|\m{1}|}}
|-
| <code>-></code> || {{chem2|->}} || <code><nowiki>{{chem2|2H2 + O2 -> 2H2O}}</nowiki></code> || {{chem2|2H2 + O2 -> 2H2O}}
|-
| <code><-></code> || {{chem2|<->}} || <code><nowiki>{{chem2|K<->L}}</nowiki></code> || {{chem2|K<->L}}
|-
| <code>*</code> || <big>{{chem2|*}}</big> || <code><nowiki>{{chem2|CoCl2*6H2O}}</nowiki></code> || {{chem2|CoCl2*6H2O}}
|-
| <code>\*</code> || * || <code><nowiki>{{chem2|Cp\*2Fe}}</nowiki></code> || {{chem2|Cp\*2Fe}}
|-
| <code>_{}</code> || <sub><small>subscript</small></sub>|| <code><nowiki>{{chem2|CH4_{(g)} |}}</nowiki></code> <span id="why-vert-bar" style="float:right">[[#vert-bar-explained|{{sup|*}}]]</span> || {{chem2|CH4_{(g)} |}} 
|-
| <code>^{}</code> || <sup><small>superscript</small></sup>|| <code><nowiki>{{chem2|^{13}CH4}}</nowiki></code> || {{chem2|^{13}CH4}}
|-
| <code>&amp;nabla;</code> || {{chem2|&nabla;}} || <code><nowiki>{{chem2|&amp;nabla;}}</nowiki></code> || {{chem2|&nabla;}}
|-
| <code>(&nbsp;)</code> || {{chem2|(&nbsp;)}} || <code><nowiki>{{chem2|R\sCH(OH)CN}}</nowiki></code> || {{chem2|R\sCH(OH)CN}}
|}

<p id="vert-bar-explained"><small>[[#why-vert-bar|'''^''']] If the last character of the template input is <code><nowiki>}</nowiki></code>, MediaWiki will confuse it with the end-of-template tag <code><nowiki>}}</nowiki></code>. Adding a space between the two resolves this ambiguity.  Other options include instead inserting <code><nowiki>{{null}}</nowiki></code> or <code><nowiki><nowiki/></nowiki></code>.</small></p>

===Formula punctuation (Chem2/sandbox)===
{| class="wikitable"
|-
! Symbol
! Gives
! Example
! Output
|-
| <code>\s</code> || {{chem2/sandbox|\s}} || <code><nowiki>{{chem2/sandbox|CH3\sCH3}}</nowiki></code> || {{chem2/sandbox|CH3\sCH3}}
|-
| <code>\d</code> || {{chem2/sandbox|\d}} || <code><nowiki>{{chem2/sandbox|CH2\dCH2}}</nowiki></code> || {{chem2/sandbox|CH2\dCH2}}
|-
| <code>\t</code> || {{chem2/sandbox|\t}}  || <code><nowiki>{{chem2/sandbox|HC\tCH}}</nowiki></code> || {{chem2/sandbox|HC\tCH}}
|-
| <code>\q</code> || {{chem2/sandbox|\q}}  || <code><nowiki>{{chem2/sandbox|[Cl4Re\qReCl4](2−)}}</nowiki></code> || {{chem2/sandbox|[Cl4Re\qReCl4](2−)}}
|-
| <code>\-</code> || {{chem2/sandbox|\-}} || <code><nowiki>{{chem2/sandbox|A\-B}}</nowiki></code> || {{chem2/sandbox|A\-B}}
|-
| <code>\\</code> || {{chem2/sandbox|\\}} || <code><nowiki>{{chem2/sandbox|C\\D}}</nowiki></code> || {{chem2/sandbox|C\\D}}
|-
| <code>\h</code> || {{chem2/sandbox|\h}} || <code><nowiki>{{chem2/sandbox|\h}}</nowiki></code> || {{chem2/sandbox|\h}}
|-
| <code>\h{1}</code> || {{chem2/sandbox|\h{1}|}} || <code><nowiki>{{chem2/sandbox|\h{1} |}}</nowiki></code> || {{chem2/sandbox|\h{1}|}}
|-
| <code>\m{1}</code> || {{chem2/sandbox|\m{1}|}} || <code><nowiki>{{chem2/sandbox|\m{1} |}}</nowiki></code> || {{chem2/sandbox|\m{1}|}}
|-
| <code>-></code> || {{chem2/sandbox|->}} || <code><nowiki>{{chem2/sandbox|2H2 + O2 -> 2H2O}}</nowiki></code> || {{chem2/sandbox|2H2 + O2 -> 2H2O}}
|-
| <code><-></code> || {{chem2/sandbox|<->}} || <code><nowiki>{{chem2/sandbox|K<->L}}</nowiki></code> || {{chem2/sandbox|K<->L}}
|-
| <code>*</code> || <big>{{chem2/sandbox|*}}</big> || <code><nowiki>{{chem2/sandbox|CoCl2*6H2O}}</nowiki></code> || {{chem2/sandbox|CoCl2*6H2O}}
|-
| <code>\*</code> || * || <code><nowiki>{{chem2/sandbox|Cp\*2Fe}}</nowiki></code> || {{chem2/sandbox|Cp\*2Fe}}
|-
| <code>_{}</code> || <sub><small>subscript</small></sub>|| <code><nowiki>{{chem2/sandbox|CH4_{(g)} |}}</nowiki></code> <span id="why-vert-bar" style="float:right">[[#vert-bar-explained|{{sup|*}}]]</span> || {{chem2/sandbox|CH4_{(g)} |}} 
|-
| <code>^{}</code> || <sup><small>superscript</small></sup>|| <code><nowiki>{{chem2/sandbox|^{13}CH4}}</nowiki></code> || {{chem2/sandbox|^{13}CH4}}
|-
| <code>&amp;nabla;</code> || {{chem2/sandbox|&nabla;}} || <code><nowiki>{{chem2/sandbox|&amp;nabla;}}</nowiki></code> || {{chem2/sandbox|&nabla;}}
|-
| <code>(&nbsp;)</code> || {{chem2/sandbox|(&nbsp;)}} || <code><nowiki>{{chem2/sandbox|R\sCH(OH)CN}}</nowiki></code> || {{chem2/sandbox|R\sCH(OH)CN}}
|}

<p id="vert-bar-explained"><small>[[#why-vert-bar|'''^''']] If the last character of the template input is <code><nowiki>}</nowiki></code>, MediaWiki will confuse it with the end-of-template tag <code><nowiki>}}</nowiki></code>. Adding a space between the two resolves this ambiguity.  Other options include instead inserting <code><nowiki>{{null}}</nowiki></code> or <code><nowiki><nowiki/></nowiki></code>.</small></p>

==from Doc==
:{{tlf|Chems}}
{| class="wikitable"
|-
! Symbol
! Gives
! Example
! Output
|-
| <code>\s</code> || {{chem2|\s}} || <code><nowiki>{{chem2|CH3\sCH3}}</nowiki></code> || {{chem2|CH3\sCH3}}
|-
| <code>\d</code> || {{chem2|\d}} || <code><nowiki>{{chem2|CH2\dCH2}}</nowiki></code> || {{chem2|CH2\dCH2}}
|-
| <code>\t</code> || {{chem2|\t}}  || <code><nowiki>{{chem2|HC\tCH}}</nowiki></code> || {{chem2|HC\tCH}}
|-
| <code>\q</code> || {{chem2|\q}}  || <code><nowiki>{{chem2|[Cl4Re\qReCl4](2−)|}}</nowiki></code> || {{chem2|[Cl4Re\qReCl4](2−)|}}
|-
| <code>\-</code> || {{chem2|\-}} || ||
|-
| <code>\\</code> || {{chem2|\\}} || ||
|-
| <code>\h</code> || {{chem2|\h}} || ||
|-
| <code>\h{1}</code> || {{chem2|\h{1}|}} || ||
|-
| <code>\m{1}</code> || {{chem2|\m{1}|}} || ||
|-
| <code>-></code> || {{chem2| ->}} || <code><nowiki>{{chem2|2H2 + O2 -> 2H2O}}</nowiki></code> || {{chem2|2H2 + O2 -> 2H2O}}
|-
| <code><-></code> || {{chem2| <->}} || ||
|-
| <code>*</code> || {{chem2|*}} || <code><nowiki>{{chem2|CoCl2*6H2O}}</nowiki></code> || {{chem2|CoCl2*6H2O}}
|-
| <code>\*</code> || * || <code><nowiki>{{chem2|Cp\*2Fe}}</nowiki></code> || {{chem2|Cp\*2Fe}}
|-
| <code>_{}</code> || || <code><nowiki>{{chem2|CH4_{(g)}|}}</nowiki></code> <span id="why-vert-bar">[[#vert-bar-explained|{{sup|*}}]]</span> || {{chem2|CH4_{(g)}|}} 
|-
| <code>^{}</code> || || <code><nowiki>{{chem2|^{13}CH4}}</nowiki></code> || {{chem2|^{13}CH4}}
|-
| <code>&amp;nabla;</code> || {{chem2|&nabla;}} || <code><nowiki>{{chem2|&amp;nabla;}}</nowiki></code> || {{chem2|&nabla;}}
|}

<p id="vert-bar-explained"><small>[[#why-vert-bar|'''^''']] If the last character of the template input is <code><nowiki>}</nowiki></code>, MediaWiki will confuse it with the end-of-template tag <code><nowiki>}}</nowiki></code>. Adding <code><nowiki>&#124;</nowiki></code> between the two resolves this ambiguity.  Other options include instead inserting <code><nowiki> </nowiki></code> (space), <code><nowiki>{{null}}</nowiki></code> or <code><nowiki><nowiki/></nowiki></code>.</small></p>

Formulas (without charge) are just written. Eg.:
* <code><nowiki>{{chem2|CH3(CH2)5CH3}}</nowiki></code> gives  {{chem2|CH3(CH2)5CH3}} 
* <code><nowiki>{{chem2|Fe3S2(CO)9}}</nowiki></code> gives {{chem2|Fe3S2(CO)9}}
* <code><nowiki>{{chem2|C_{''n''}H_{2''n''+2}|}}</nowiki></code> gives {{chem2|C_{''n''}H_{2''n''+2}|}}

Charges are written inside parenthesis, otherwise its treated as +1 or −1, e.g.:
* <code><nowiki>{{chem2|Na+}}</nowiki></code> gives {{chem2|Na+}}
* <code><nowiki>{{chem2|O2-}}</nowiki></code> gives {{chem2|O2-}} but can be written as <code><nowiki>{{chem2|O2(-)}}</nowiki></code> too.
* <code><nowiki>{{chem2|SO4(2-)}}</nowiki></code> gives {{chem2|SO4(2-)}} 
* <code><nowiki>{{chem2|S19(2+)}}</nowiki></code> gives {{chem2|S19(2+)}} 

Chemical equations can be written too. E.g.:
* <code><nowiki>{{chem2|2 S + 3 O2 + 2 H2O -> 2 H2SO4}}</nowiki></code> gives {{chem2|2 S + 3 O2 + 2 H2O -> 2 H2SO4}}
* <code><nowiki>{{chem2|2S + 3O2 + 2H2O -> 2H2SO4}}</nowiki></code> gives {{chem2|2S + 3O2 + 2H2O -> 2H2SO4}}
The arrows can be written as <code>-></code> or just <code>→</code>. All characters (and unicode markup) are valid input except <code>\</code>, = (Mediawiki use it), <code>_</code> and <code>-</code> (endash etc.)
* <code><nowiki>{{chem2|2 H2_{(g)} + O2_{(g)} -> 2H2O_{(g)}|}}</nowiki></code> gives {{chem2|2 H2_{(g)} + O2_{(g)} -> 2H2O_{(g)}|}}
* <code><nowiki>{{chem2|NH2RCHCO2H <-> NH3+RCHCO2-}}</nowiki></code> gives {{chem2|NH2RCHCO2H <-> NH3+RCHCO2-}}

[[Hapticity]] and mu:
* <code><nowiki>{{chem2|W(CO)3(PiPr3)2(\h{2}\-H2)}}</nowiki></code> gives {{chem2|W(CO)3(PiPr3)2(\h{2}\-H2)}}
* <code><nowiki>{{chem2|auto=yes|W(CO)3(PiPr3)2(\h{2}\-H2)}}</nowiki></code> gives {{chem2|auto=yes|W(CO)3(PiPr3)2(\h{2}\-H2)}}

Links: Use <code><nowiki>link=</nowiki></code><wiki page> or ordinary wiki link (<code><nowiki>[[</nowiki></code> and <code><nowiki>]]</nowiki></code>), e.g.:
* <code><nowiki>{{chem2|link=Iron(III) chloride|FeCl3}}</nowiki></code> gives {{chem2|link=Iron(III) chloride|FeCl3}}
* <code><nowiki>{{chem2|3[[hydrogen|H2]] + 2[[nitrogen|N2]] <-> 2[[ammonia|NH3]]}}</nowiki></code> gives {{chem2|3[[hydrogen|H2]] + 2[[nitrogen|N2]] <-> 2[[ammonia|NH3]]}}

Auto links: Automatic link elements: Use <code><nowiki>auto=</nowiki></code><something> (e.g. <code><nowiki>yes</nowiki></code>):
* <code><nowiki>{{chem2|auto=yes|CH3CH2CH3CBrFCIClCH3}}</nowiki></code> gives {{chem2|auto=yes|CH3CH2CH3CBrFCIClCH3}}

===All /sandbox===
;{{tlf|Chems/sandbox}}
{| class="wikitable"
|-
! Symbol
! Gives
! Example
! Output
|-
| <code>\s</code> || {{chem2/sandbox|\s}} || <code><nowiki>{{chem2/sandbox|CH3\sCH3}}</nowiki></code> || {{chem2/sandbox|CH3\sCH3}}
|-
| <code>\d</code> || {{chem2/sandbox|\d}} || <code><nowiki>{{chem2/sandbox|CH2\dCH2}}</nowiki></code> || {{chem2/sandbox|CH2\dCH2}}
|-
| <code>\t</code> || {{chem2/sandbox|\t}}  || <code><nowiki>{{chem2/sandbox|HC\tCH}}</nowiki></code> || {{chem2/sandbox|HC\tCH}}
|-
| <code>\q</code> || {{chem2/sandbox|\q}}  || <code><nowiki>{{chem2/sandbox|[Cl4Re\qReCl4](2−)|}}</nowiki></code> || {{chem2/sandbox|[Cl4Re\qReCl4](2−)|}}
|-
| <code>\-</code> || {{chem2/sandbox|\-}} || ||
|-
| <code>\\</code> || {{chem2/sandbox|\\}} || ||
|-
| <code>\h</code> || {{chem2/sandbox|\h}} || ||
|-
| <code>\h{1}</code> || {{chem2/sandbox|\h{1}|}} || ||
|-
| <code>\m{1}</code> || {{chem2/sandbox|\m{1}|}} || ||
|-
| <code>-></code> || {{chem2/sandbox| ->}} || <code><nowiki>{{chem2/sandbox|2H2 + O2 -> 2H2O}}</nowiki></code> || {{chem2/sandbox|2H2 + O2 -> 2H2O}}
|-
| <code><-></code> || {{chem2/sandbox| <->}} || ||
|-
| <code>*</code> || {{chem2/sandbox|*}} || <code><nowiki>{{chem2/sandbox|CoCl2*6H2O}}</nowiki></code> || {{chem2/sandbox|CoCl2*6H2O}}
|-
| <code>\*</code> || * || <code><nowiki>{{chem2/sandbox|Cp\*2Fe}}</nowiki></code> || {{chem2/sandbox|Cp\*2Fe}}
|-
| <code>_{}</code> || || <code><nowiki>{{chem2/sandbox|CH4_{(g)}|}}</nowiki></code> <span id="why-vert-bar">[[#vert-bar-explained|{{sup|*}}]]</span> || {{chem2/sandbox|CH4_{(g)}|}} 
|-
| <code>^{}</code> || || <code><nowiki>{{chem2/sandbox|^{13}CH4}}</nowiki></code> || {{chem2/sandbox|^{13}CH4}}
|-
| <code>&amp;nabla;</code> || {{chem2/sandbox|&nabla;}} || <code><nowiki>{{chem2/sandbox|&amp;nabla;}}</nowiki></code> || {{chem2/sandbox|&nabla;}}
|}

<p id="vert-bar-explained"><small>[[#why-vert-bar|'''^''']] If the last character of the template input is <code><nowiki>}</nowiki></code>, MediaWiki will confuse it with the end-of-template tag <code><nowiki>}}</nowiki></code>. Adding <code><nowiki>&#124;</nowiki></code> between the two resolves this ambiguity.  Other options include instead inserting <code><nowiki> </nowiki></code> (space), <code><nowiki>{{null}}</nowiki></code> or <code><nowiki><nowiki/></nowiki></code>.</small></p>
==/doc==
:using /sandbox

===/doc Formula punctuation===
{| class="wikitable"
|-
! Symbol
! Gives
! Example
! Output
|-
| <code>\s</code> || {{chem2|\s}} || <code><nowiki>{{chem2|CH3\sCH3}}</nowiki></code> || {{chem2|CH3\sCH3}}
|-
| <code>\d</code> || {{chem2|\d}} || <code><nowiki>{{chem2|CH2\dCH2}}</nowiki></code> || {{chem2|CH2\dCH2}}
|-
| <code>\t</code> || {{chem2|\t}}  || <code><nowiki>{{chem2|HC\tCH}}</nowiki></code> || {{chem2|HC\tCH}}
|-
| <code>\q</code> || {{chem2|\q}}  || <code><nowiki>{{chem2|[Cl4Re\qReCl4](2−)}}</nowiki></code> || {{chem2|[Cl4Re\qReCl4](2−)}}
|-
| <code>\-</code> || {{chem2|\-}} || <code><nowiki>{{chem2|A\-B}}</nowiki></code> || {{chem2|A\-B}}
|-
| <code>\\</code> || {{chem2|\\}} || <code><nowiki>{{chem2|C\\D}}</nowiki></code> || {{chem2|C\\D}}
|-
| <code>\h</code> || {{chem2|\h}} || <code><nowiki>{{chem2|\h}}</nowiki></code> || {{chem2|\h}}
|-
| <code>\h{1}</code> || {{chem2|\h{1}|}} || <code><nowiki>{{chem2|\h{1} |}}</nowiki></code> || {{chem2|\h{1}|}}
|-
| <code>\m{1}</code> || {{chem2|\m{1}|}} || <code><nowiki>{{chem2|\m{1} |}}</nowiki></code> || {{chem2|\m{1}|}}
|-
| <code>-></code> || {{chem2|->}} || <code><nowiki>{{chem2|2H2 + O2 -> 2H2O}}</nowiki></code> || {{chem2|2H2 + O2 -> 2H2O}}
|-
| <code><-></code> || {{chem2|<->}} || <code><nowiki>{{chem2|K<->L}}</nowiki></code> || {{chem2|K<->L}}
|-
| <code>*</code> || <big>{{chem2|*}}</big> || <code><nowiki>{{chem2|CoCl2*6H2O}}</nowiki></code> || {{chem2|CoCl2*6H2O}}
|-
| <code>\*</code> || * || <code><nowiki>{{chem2|Cp\*2Fe}}</nowiki></code> || {{chem2|Cp\*2Fe}}
|-
| <code>_{}</code> || <sub><small>subscript</small></sub>|| <code><nowiki>{{chem2|CH4_{(g)} |}}</nowiki></code> <span id="why-vert-bar" style="float:right">[[#vert-bar-explained|{{sup|*}}]]</span> || {{chem2|CH4_{(g)} |}} 
|-
| <code>^{}</code> || <sup><small>superscript</small></sup>|| <code><nowiki>{{chem2|^{13}CH4}}</nowiki></code> || {{chem2|^{13}CH4}}
|-
| <code>&amp;nabla;</code> || {{chem2|&nabla;}} || <code><nowiki>{{chem2|&amp;nabla;}}</nowiki></code> || {{chem2|&nabla;}}
|-
| <code>(&nbsp;)</code> || {{chem2|(&nbsp;)}} || <code><nowiki>{{chem2|R\sCH(OH)CN}}</nowiki></code> || {{chem2|R\sCH(OH)CN}}
|}

<p id="vert-bar-explained"><small>[[#why-vert-bar|'''^''']] If the last character of the template input is <code><nowiki>}</nowiki></code>, MediaWiki will confuse it with the end-of-template tag <code><nowiki>}}</nowiki></code>. Adding a space between the two resolves this ambiguity.  Other options include instead inserting <code><nowiki>{{null}}</nowiki></code> or <code><nowiki><nowiki/></nowiki></code>.</small></p>

===/doc Formulas, charges, equations===
Formulas (without charge) are just written:
* <code><nowiki>{{chem2|CH3(CH2)5CH3}}</nowiki></code> &rarr;  {{chem2|CH3(CH2)5CH3}} 
* <code><nowiki>{{chem2|Fe3S2(CO)9}}</nowiki></code> &rarr; {{chem2|Fe3S2(CO)9}}
* <code><nowiki>{{chem2|C_{''n''}H_{2''n''+2}|}}</nowiki></code> &rarr; {{chem2|C_{''n''}H_{2''n''+2}|}}

Charges are written inside parentheses:
* <code><nowiki>{{chem2|SO4(2-)}}</nowiki></code> &rarr; {{chem2|SO4(2-)}} 
* <code><nowiki>{{chem2|S19(2+)}}</nowiki></code> &rarr; {{chem2|S19(2+)}} 

Charges +1 and &minus;1 can be written plain:
* <code><nowiki>{{chem2|Na+}}</nowiki></code> &rarr; {{chem2|Na+}}
* <code><nowiki>{{chem2|O2-}}</nowiki></code> &rarr; {{chem2|O2-}}
: equals <code><nowiki>{{chem2|O2(-)}}</nowiki></code>

Chemical equations:
* <code><nowiki>{{chem2|2 S + 3 O2 + 2 H2O -> 2 H2SO4}}</nowiki></code> &rarr; {{chem2|2 S + 3 O2 + 2 H2O -> 2 H2SO4}}
* <code><nowiki>{{chem2|2S + 3O2 + 2H2O -> 2H2SO4}}</nowiki></code> &rarr; {{chem2|2S + 3O2 + 2H2O -> 2H2SO4}}
The arrows can be written as <code>-></code> or just <code>→</code>. All characters (and unicode markup) are valid input except <code>\</code>, = (Mediawiki use it), <code>_</code> and <code>-</code> (endash etc.)
* <code><nowiki>{{chem2|2 H2_{(g)} + O2_{(g)} -> 2H2O_{(g)}|}}</nowiki></code> &rarr; {{chem2|2 H2_{(g)} + O2_{(g)} -> 2H2O_{(g)}|}}
* <code><nowiki>{{chem2|NH2RCHCO2H <-> NH3+RCHCO2-}}</nowiki></code> &rarr; {{chem2|NH2RCHCO2H <-> NH3+RCHCO2-}}

[[Hapticity]] and mu:
* <code><nowiki>{{chem2|W(CO)3(PiPr3)2(\h{2}H2)}}</nowiki></code> &rarr; {{chem2|W(CO)3(PiPr3)2(\h{2}H2)}}
* <code><nowiki>{{chem2|auto=yes|W(CO)3(PiPr3)2(\h{2}H2)}}</nowiki></code> &rarr; {{chem2|auto=yes|W(CO)3(PiPr3)2(\h{2}H2)}}

===/doc Wikilinks===
====/doc Whole formula link====
Link the whole formula with {{para|link|&lt;wiki pagename&gt;}}:
* {{#invoke:demoTemplate|chem2|link=Iron(III) chloride|FeCl3}}

Or use wikilink brackets in input like <code><nowiki>[[ammonia|NH3]]</nowiki></code>:
* {{#invoke:demoTemplate|chem2|3[[hydrogen|H2]] + 2[[nitrogen|N2]] <-> 2[[ammonia|NH3]]}}

====/doc Link each element (C, Hg) and generic element code (R, X)====
:Use {{para|auto|yes}} to link each element symbol once, as well as some others such as {{chem2|auto=1|Ph}}
* {{#invoke:demoTemplate|chem2|auto=yes|CH3CH2CH3CBrFCIClCH3}}

====/doc Link functional groups====
Some common '''groups''' are recognized and linked if you wikilink them using <code><nowiki>[[&nbsp;]]</nowiki></code>
* {{#invoke:demoTemplate|chem2|R\-[[COOH]]}}
* {{#invoke:demoTemplate|chem2|[[CH3]]C[[R]]2[[I]]}}
* In particular H2O links to [[water of crystallization]] in {{#invoke:demoTemplate|chem2|CuSO4 * 5 [[H2O]]}}, because a link to water is generally unnecessary.

You can link to any article even if chem2 is unaware of it:!-- same as |link=... then -->
* {{#invoke:demoTemplate|chem2|[[C6H5NH2]]}} 

To change the default link:
* {{#invoke:demoTemplate|chem2|[[water|H2O]]}}

====/doc All recognised symbols and codes====
{{cot |bg=#CEF2E0 |title=All link targets recognised by {{tlf|chem2}} (elements, general codes, functional groups)}}
{{div col}}
{{#invoke:chem2|_autodoc}}
{{div col end}}
{{cob}}

===/doc Examples ===
* <code><nowiki>{{chem2|[Cl4Re\qReCl4](2−)|}}</nowiki></code> gives {{chem2|[Cl4Re\qReCl4](2−)|}}
* <code><nowiki>{{chem2|[Cl4Re\qReCl4](2-)|}}</nowiki></code> gives {{chem2|[Cl4Re\qReCl4](2-)|}}
* <code><nowiki>{{chem2|NH2RCHCO2H <-> NH3+RCHCO2−}}</nowiki></code> gives {{chem2|NH2RCHCO2H <-> NH3+RCHCO2−}}
----
* <code><nowiki>{{chem2|\\hallo}}</nowiki></code> gives {{chem2|\\hallo}}
* <code><nowiki>{{chem2|H3CC\tCH <-> H2C\dC\dCH2}}</nowiki></code> gives {{chem2|H3CC\tCH <-> H2C\dC\dCH2}}
* <code><nowiki>{{chem2|4 NH3 + 5 O2 -> 4 NO + 6 H2O}}</nowiki></code> gives {{chem2|4 NH3 + 5 O2 -> 4 NO + 6 H2O}}
----
* "H2O &amp;#8594; H2O" is {{chem2|H2O &#8594; H2O}}
* "H2O_{(l)} -> H2O_{(g)}" is {{chem2|H2O_{(l)} -> H2O_{(g)}|}}
----
* "4 NH3 + 5 O2 → 4 NO + 6 H2O" is {{chem2|4 NH3 + 5 O2 → 4 NO + 6 H2O}}
* " 4 NH3 + 5 O2 → 4 NO + 6 H2O" is {{chem2| 4 NH3 + 5 O2 → 4 NO + 6 H2O}}
* " 4NH3 + 5O2 → 4NO + 6H2O" is {{chem2| 4NH3 + 5O2 → 4NO + 6H2O}}
* " 2Mn2(+)" is {{chem2| 2Mn2(+)}}
* " 2Mn2(+) + 3H2O" is {{chem2| 2Mn2(+) + 3H2O}}
* Mn– is {{chem2|Mn–}}
----
* Mn2(2-) is {{chem2|Mn2(2-)}}
* Mn2☃+ is {{chem2|Mn2☃+}}, Mn2(2–) is {{chem2|Mn2(2–)}}, Mn2(2☃–) is {{chem2|Mn2(2☃–)}}
* Mn2(+) is {{chem2|Mn2(+)}}
* Mn2+ is {{chem2|Mn2+}}
* Mn2(-) is {{chem2|Mn2(-)}}
* Mn2- is {{chem2|Mn2-}}
----
*<nowiki>{{chem2|C_{''n''}H_{2''n''&nbsp;+&nbsp;2}|}}</nowiki> gives {{chem2|C_{''n''}H_{2''n''&nbsp;+&nbsp;2}|}}
*<nowiki>{{chem2|C_{abc}|}}</nowiki> gives {{chem2|C_{abc}|}}
*(chem gives {{chem|C|''n''|H|2''n''&nbsp;+&nbsp;2}})
*<nowiki>{{chem2|CoCl2*1.5H2O}}</nowiki> gives {{chem2|CoCl2*1.5H2O}}
*Mn22– is {{chem2|Mn22–}}
* Cu2C2*H2O is {{chem2|Cu2C2*H2O}} 
----
;Special

*<nowiki>{{chem2|[Me2Al(\m{2}Me)]2}}</nowiki> gives {{chem2|[Me2Al(\m{2}Me)]2}}
*<nowiki>{{chem2|^{13}CO2}}</nowiki> gives {{chem2|^{13}CO2}}
*<nowiki>{{chem2|auto=yes|^{13}CO2}}</nowiki> gives {{chem2|auto=yes|^{13}CO2}}
*<nowiki>{{chem2|\h{5}(C5H5)2TiCl2}}</nowiki> gives {{chem2|\h{5}(C5H5)2TiCl2}}
*<nowiki>{{chem2|\h{5}\s(C5H5)}}</nowiki> gives {{chem2|\h{5}\s(C5H5)}}
*<nowiki>{{chem2|CH2\dCH2\sCH2\sC\tCH\qMn}}</nowiki> is {{chem2|CH2\dCH2\sCH2\sC\tCH\qMn}}
----
*<nowiki>{{chem2|RC(OR’)3}}</nowiki> gives {{chem2|RC(OR’)3}}
*<nowiki>{{chem2|C\\C}}</nowiki> gives {{chem2|C\\C}}
*<nowiki>{{chem2|C2*NH3}}</nowiki> gives {{chem2|C2*NH3}}
*<nowiki>{{chem2|C2*2NH3}}</nowiki> gives {{chem2|C2*2NH3}}
*<nowiki>{{chem2|C1.2H3.5}}</nowiki> gives {{chem2|C1.2H3.5}}
----
* <nowiki>{{chem2|12|6|C}}</nowiki> is {{chem2|12|6|C}}
* <nowiki>{{chem2|12|C}}</nowiki> is {{chem2|12|C}}
* <nowiki>{{chem2|CH3\i{13}CH2CH3}}</nowiki> is {{chem2|CH3\i{13}CH2CH3}}
* <nowiki>{{chem2|\{\{abc\}\}}}</nowiki> is {{chem2|\b\bAbC\e\e}}
* C2(μ\-C) is {{chem2|C2(μ\-C) }}
----
* SO4(2-) is {{chem2|SO4(2-)}}
* 2Mn2(2+) is {{chem2|2Mn2(2+)}}
* CH3-CH2-OH is {{chem2|CH3-CH2-OH}}
* [ZnCl4]- is {{chem2|[ZnCl4]-}}
* [ZnCl4](2-) is {{chem2|[ZnCl4](2-)}}
* AUTO: ((H2O)5{CoCl2})2 is {{chem2|auto=yes|((H2O)5{CoCl2})2}}
* Si(OH)4 is {{chem2|Si(OH)4}}
----
* AUTO: Cu2C2*H2O is {{chem2|auto=yes|Cu2C2*H2O}} 
* Cu2C2*2H2O is {{chem2|Cu2C2*2H2O}} 
* CuSO*2H2O is {{chem2|CuSO*2H2O}} 
* CuSO4*15H2O is {{chem2|CuSO4*15H2O}} 
* CuSO4(H2O)5 is {{chem2|CuSO4(H2O)5}} 
* H+ + OH- → H2O is {{chem2|H+ + OH- → H2O}}
* H → O is {{chem2|H → O }}
----
* ZxPo4 is {{chem2|ZxPo4}}        &nbsp;&nbsp;&nbsp;&nbsp;Unknown element.
* ((Na)Cl is {{chem2|((Na)Cl}}      &nbsp;&nbsp;&nbsp;&nbsp;Too many "(".
* Si(OH))4 is {{chem2|Si(OH))4}}     &nbsp;&nbsp;&nbsp;&nbsp;Too many ")".
* Si&[[☃]]Si is {{chem2|Si&[[☃]]Si}}
* {{chem2|1=CH2=CH2}}

====/doc  More ====
* <nowiki>{{chem2|Cl2O6|link=dichlorine hexoxide}}</nowiki> is {{chem2|Cl2O6|link=dichlorine hexoxide}}
* [Fe(Phen)(Phen)3](2+) is {{chem2|[Fe(Phen)(Phen)3](2+)}}
* AUTO: [Fe(Phen)(Phen)3](2+) is {{chem2|auto=yes|[Fe(Phen)(Phen)3](2+)}}
* <nowiki>{{chem2|[C2O2](2+)}}</nowiki> is {{chem2|[C2O2](2+)}}
* <nowiki>{{chem2|link=Tomato|SI4}}</nowiki> is {{chem2|link=Tomato|SI4}}
* H2SO4+ is {{chem2|H2SO4+}}
* Mn- is {{chem2|Mn-}}
* Mn22+ is {{chem2|Mn22+}}, Mn22- is {{chem2|Mn22-}}, 
* Mn(2+) is {{chem2|Mn(2+)}}
* Mn2(+) is {{chem2|Mn2(+)}}
* Mn(22-) is {{chem2|Mn(22-)}}
* Mn3(22-) is {{chem2|Mn3(22-)}}
* Mn(22+) is {{chem2|Mn(22+)}}
* Mn2(22+) is {{chem2|Mn2(22+)}}
* Mn2(2+) is {{chem2|Mn2(2+)}}
* Mn22(2+) is {{chem2|Mn22(2+)}}

==Predefined codes (groups etc.) {{anchor|Predefined}}==
{| class="wikitable sortable collapsible" style="font-size"90%"
|-
! colspan="5" | Predefined codes
|-
! code
! target article
! <code><nowiki>{{Chem2|code}}</nowiki></code>
! type
! note
|-
! colspan="5" style="text-align:left;" | A. Groups etc with element-like names

{{Chem2/doc/row |code=Bz |wl=Benzoyl group |addwl=no |type=A |note= }}
{{Chem2/doc/row |code=Et |wl=Ethyl group |addwl=no |type=A |note= }}
{{Chem2/doc/row |code=Ln |wl=Lanthanide |addwl=no |type=A |note= }}
{{Chem2/doc/row |code=Nu |wl=Nucleophile |addwl=no |type=A |note= }}
{{Chem2/doc/row |code=Ph |wl=Phenyl group |addwl=no |type=A |note= }}
{{Chem2/doc/row |code=R  |wl=Substituent |addwl=no |type=A |note= }}
{{Chem2/doc/row |code=T  |wl=Tritium |addwl=no |type=A |note= }}
{{Chem2/doc/row |code=Tf |wl=Trifluoromethylsulfonyl group |addwl=no |type=A |note= }}
{{Chem2/doc/row |code=X  |wl=Halogen |addwl=no |type=A |note= }}
|-
! colspan="5" style="text-align:left;" | B. Groups which are redirected from their normal target if wikilinked; never autolinked.
{{Chem2/doc/row |code=CH3  |wl=Methyl group |addwl=yes |type=B |note= }}
{{Chem2/doc/row |code=CO3  |wl=Carbonate |addwl=yes |type=B |note= }}
{{Chem2/doc/row |code=COOH |wl=Carboxyl group |addwl=yes |type=B |note= }}
{{Chem2/doc/row |code=ClO  |wl=Hypochlorite |addwl=yes |type=B |note= }}
{{Chem2/doc/row |code=ClO2 |wl=Chlorite |addwl=yes |type=B |note= }}
{{Chem2/doc/row |code=ClO3 |wl=Chlorate |addwl=yes |type=B |note= }}
{{Chem2/doc/row |code=ClO4 |wl=Perchlorate |addwl=yes |type=B |note= }}
{{Chem2/doc/row |code=H2O |wl=Water of crystallization |addwl=yes |type=B |note= }}
{{Chem2/doc/row |code=H3O |wl=Hydronium |addwl=yes |type=B |note= }}
{{Chem2/doc/row |code=NH2 |wl=Amine group |addwl=yes |type=B |note= }}
{{Chem2/doc/row |code=NH4 |wl=Ammonium |addwl=yes |type=B |note= }}
{{Chem2/doc/row |code=NO3 |wl=Nitrate |addwl=yes |type=B |note= }}
{{Chem2/doc/row |code=PO3 |wl=Phosphite |addwl=yes |type=B |note= }}
{{Chem2/doc/row |code=PO4 |wl=Phosphate |addwl=yes |type=B |note= }}
{{Chem2/doc/row |code=SH  |wl=Thiol group |addwl=yes |type=B |note= }}
{{Chem2/doc/row |code=SO3 |wl=Sulfite |addwl=yes |type=B |note= }}
{{Chem2/doc/row |code=SO4 |wl=Sulfate |addwl=yes |type=B |note= }}
{{Chem2/doc/row |code=SeH |wl=Selenol group |addwl=yes |type=B |note= }}
|}

===/doc Line wrapping===
{| align=right class=wikitable style="float:right"
! colspan=3 |  Table 1: Incnis Mrsi original post demo<br/>{{nobold|1=(extended by DMacks)}}
|-
 !rowspan=17 |Incnis<br/>Mrsi's<br/>original
 !width:8em | sandbox (nowrap)
 !width:8em | current live (wraps)
 |-
 |<div style="max-width:2.75em; xxxoverflow:hidden">{{chem2/sandbox|CO3(2-)}}</div>
 |<div style="max-width:2.75em; xxxoverflow:hidden" class="">{{chem2|CO3(2-)}}</div>
 |-
 |<div style="max-width:2.7em; xxxoverflow:hidden">{{chem2/sandbox|CO3(2-)}}</div>
 |<div style="max-width:2.7em; xxxoverflow:hidden" class="">{{chem2|CO3(2-)}}</div>
 |-
 |<div style="max-width:2.65em; xxxoverflow:hidden">{{chem2/sandbox|CO3(2-)}}</div>
 |<div style="max-width:2.65em; xxxoverflow:hidden" class="">{{chem2|CO3(2-)}}</div>
 |-
 |<div style="max-width:2.6em; xxxoverflow:hidden">{{chem2/sandbox|CO3(2-)}}</div>
 |<div style="max-width:2.6em; xxxoverflow:hidden" class="">{{chem2|CO3(2-)}}</div>
 |-
 |<div style="max-width:2.55em; xxxoverflow:hidden">{{chem2/sandbox|CO3(2-)}}</div>
 |<div style="max-width:2.55em; xxxoverflow:hidden" class="">{{chem2|CO3(2-)}}</div>
 |-
 |<div style="max-width:2.5em; xxxoverflow:hidden">{{chem2/sandbox|CO3(2-)}}</div>
 |<div style="max-width:2.5em; xxxoverflow:hidden" class="">{{chem2|CO3(2-)}}</div>
 |-
 |<div style="max-width:2.45em; xxxoverflow:hidden">{{chem2/sandbox|CO3(2-)}}</div>
 |<div style="max-width:2.45em; xxxoverflow:hidden" class="">{{chem2|CO3(2-)}}</div>
 |-
 |<div style="max-width:2.4em; xxxoverflow:hidden">{{chem2/sandbox|CO3(2-)}}</div>
 |<div style="max-width:2.4em; xxxoverflow:hidden" class="">{{chem2|CO3(2-)}}</div>
 |-
 |<div style="max-width:2.35em; xxxoverflow:hidden">{{chem2/sandbox|CO3(2-)}}</div>
 |<div style="max-width:2.35em; xxxoverflow:hidden" class="">{{chem2|CO3(2-)}}</div>
 |-
 |<div style="max-width:2.3em; xxxoverflow:hidden">{{chem2/sandbox|CO3(2-)}}</div>
 |<div style="max-width:2.3em; xxxoverflow:hidden" class="">{{chem2|CO3(2-)}}</div>
 |-
 |<div style="max-width:2.25em; xxxoverflow:hidden">{{chem2/sandbox|CO3(2-)}}</div>
 |<div style="max-width:2.25em; xxxoverflow:hidden" class="">{{chem2|CO3(2-)}}</div>
 |-
 |<div style="max-width:2.2em; xxxoverflow:hidden">{{chem2/sandbox|CO3(2-)}}</div>
 |<div style="max-width:2.2em; xxxoverflow:hidden" class="">{{chem2|CO3(2-)}}</div>
 |-
 |<div style="max-width:2.15em; xxxoverflow:hidden">{{chem2/sandbox|CO3(2-)}}</div>
 |<div style="max-width:2.15em; xxxoverflow:hidden" class="">{{chem2|CO3(2-)}}</div>
 |-
 |<div style="max-width:2.1em; xxxoverflow:hidden">{{chem2/sandbox|CO3(2-)}}</div>
 |<div style="max-width:2.1em; xxxoverflow:hidden" class="">{{chem2|CO3(2-)}}</div>
 |-
 |<div style="max-width:2.05em; xxxoverflow:hidden">{{chem2/sandbox|CO3(2-)}}</div>
 |<div style="max-width:2.05em; xxxoverflow:hidden" class="">{{chem2|CO3(2-)}}</div>
 |-
 |<div style="max-width:2.0em; xxxoverflow:hidden">{{chem2/sandbox|CO3(2-)}}</div>
 |<div style="max-width:2.0em; xxxoverflow:hidden" class="">{{chem2|CO3(2-)}}</div>
 |-
 !rowspan=3 |DMacks's<br/>additions
 |<div style="max-width:2.0em; xxxxxxoverflow:hidden">{{chem2/sandbox|C6H12O6}}</div>
 |<div style="max-width:2.0em; xxxxxxoverflow:hidden class="">{{chem2|C6H12O6}}</div>
 |-
 |<div style="max-width:2.0em; xxxxxxoverflow:hidden">{{chem2/sandbox|C6H12O6}}</div>
 |<div style="max-width:2.0em; xxxxxxoverflow:hidden"><span class="">{{chem2|C6H12O6}}</span></div>
 |-
 |<div style="max-width:2.0em; xxxxxxoverflow:hidden">{{chem2/sandbox|2H2 + O2 -> 2H2O}}{{wbr}}+heat</div>
 |<div style="max-width:2.0em; xxxxxxoverflow:hidden"><span class="">{{chem2|2H2 + O2 -> 2H2O}}{{wbr}}+heat</span></div>
|}


{| class=wikitable
! colspan=2 | Table 2 
|-
 |<div style="max-width:5em; xxxoverflow:hidden">C<sub>2</sub>H<sub>5</sub> OH</div>
 |<div style="max-width:6em; xxxoverflow:hidden">CH<sub>3</sub> COO<sup>−</sup></div>
 |-
 |<div style="max-width:4.5em;">C<sub>2</sub>H<sub>5</sub> OH</div>
 |<div style="max-width:5.4em; xxxoverflow:hidden">CH<sub>3</sub> COO<sup>−</sup></div>
 |-
 |<div style="max-width:4em; xxxoverflow:hidden">C<sub>2</sub>H<sub>5</sub> OH</div>
 |<div style="max-width:4.8em; xxxoverflow:hidden">CH<sub>3</sub> COO<sup>−</sup></div>
 |-
 |<div style="max-width:3.5em;">C<sub>2</sub>H<sub>5</sub> OH</div>
 |<div style="max-width:4.2em; xxxoverflow:hidden">CH<sub>3</sub> COO<sup>−</sup></div>
 |-
 |<div style="max-width:3em; xxxoverflow:hidden">C<sub>2</sub>H<sub>5</sub> OH</div>
 |<div style="max-width:3.6em; xxxoverflow:hidden">CH<sub>3</sub> COO<sup>−</sup></div>
 |-
 |<div style="max-width:2.5em;">C<sub>2</sub>H<sub>5</sub> OH</div>
 |<div style="max-width:3.0em; xxxoverflow:hidden">CH<sub>3</sub> COO<sup>−</sup></div>
 |-
 |<div style="max-width:2.25em; xxxoverflow:hidden">C<sub>2</sub>H<sub>5</sub> OH</div>
 |<div style="max-width:2.7em; xxxoverflow:hidden">CH<sub>3</sub> COO<sup>−</sup></div>
 |-
 |<div style="max-width:2em; xxxoverflow:hidden">C<sub>2</sub>H<sub>5</sub> OH</div>
 |<div style="max-width:2.4em; xxxoverflow:hidden">CH<sub>3</sub> COO<sup>−</sup></div>
 |-
 |<div style="max-width:1.75em; xxxoverflow:hidden">C<sub>2</sub>H<sub>5</sub> OH</div>
 |<div style="max-width:2.1em; xxxoverflow:hidden">CH<sub>3</sub> COO<sup>−</sup></div>
 |-
 | colspan=2 |Attention!<br/>It is not &#123;{chem2}},</br>it is HTML.
 |}
{{clear}}

== Automated testcases ==
{{div col}}
{{test case|_format=columns|_collapsible=yes|_titlecode=yes|H2O}}
{{test case|_format=columns|_collapsible=yes|_title=Multiple arguments - not supported|H|2|O}}
{{test case|_format=columns|_collapsible=yes|_titlecode=yes|H2O|link=water}}
{{test case|_format=columns|_collapsible=yes|_titlecode=yes|H2O|auto=1}}
{{test case|_format=columns|_collapsible=yes|_title=hyphen|CH3-CH3|auto=1}}
{{test case|_format=columns|_collapsible=yes|_title=en-dash|CH3–CH3|auto=1}}
{{test case|_format=columns|_collapsible=yes|_title=minus sign|CH3−CH3|auto=1}}
{{test case|_format=columns|_collapsible=yes|_title=Wikilinks with numbers|[[CH3]]CH2OH}}
{{test case|_format=columns|_collapsible=yes|_title=Auto-link next to [|[Fe(Phen)(Phen)3](2+)|auto=1}}
{{test case|_format=columns|_collapsible=yes|_title=Manual link next to [|[[[Iron|Fe]](Phen)(Phen)3](2+)}}
{{div col end}}

==autodoc==
* <code><nowiki>{{#invoke:chem2|_autodoc}}</nowiki></code> &rarr;
:''Adds sections:''
<pre>
 === Elements and element-style symbols ===
 === Groups ===
</pre>

{{cot|title=autodoc tables}}
 (start of autodoc)
{{#invoke:chem2|_autodoc}}
 (end of autodoc)
{{cob|title=autodoc tables}}
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