Highlight replace_regex replacement capture substitutions as `Ident…

…ifier`

This is more semantically correct based on `:help group-name`, and now that `just` has actual constants it doesn't make sense to highlight these as `Constant`.

syntax/just.vim

@@ -341,7 +341,7 @@ hi def link justRecipeAttrSep                    Operator
 hi def link justRecipeColon                      Operator
 hi def link justRecipeDepParamsParen             Delimiter
 hi def link justRecipeSubsequentDeps             Operator
-hi def link justRegexCapture                     Constant
+hi def link justRegexCapture                     Identifier
 hi def link justSet                              Statement
 hi def link justSetDeprecatedKeywords            Underlined
 hi def link justSetKeywords                      Keyword

tests/cases/line-continuations.html

@@ -45,7 +45,7 @@
 ( <span class="Special">\</span>
   <span class="String">"FOOoo"</span>,
   <span class="String">"([A-Z])[A-Z]+([^A-Z])"</span>, <span class="Special">\</span>
-  <span class="String">"</span><span class="Constant">$1${2}</span><span class="String">"</span>
+  <span class="String">"</span><span class="Identifier">$1${2}</span><span class="String">"</span>
 <span class="Special">\</span>
 )
 
@@ -140,7 +140,7 @@
 <span class="Operator">=</span><span class="Special">\</span>
 <span class="Function">replace_regex</span>(<span class="Function">uuid</span>(),
 <span class="Special">\</span>
-<span class="String">'^(.+)$'</span>, <span class="String">"</span><span class="Special">\"\\\"</span><span class="Constant">$1</span><span class="Special">\\\"\"</span><span class="String">"</span>) <span class="Identifier">param3</span><span class="Operator">=</span> <span class="Special">\</span>
+<span class="String">'^(.+)$'</span>, <span class="String">"</span><span class="Special">\"\\\"</span><span class="Identifier">$1</span><span class="Special">\\\"\"</span><span class="String">"</span>) <span class="Identifier">param3</span><span class="Operator">=</span> <span class="Special">\</span>
   <span class="Function">env</span><span class="Special">\</span>
     (<span class="String">'BAR'</span>,
 

tests/cases/recipes-with-extras.html

@@ -3,7 +3,7 @@
 
 p1 <span class="Operator">:=</span> <span class="String">'test'</span>
 p2 <span class="Operator">:=</span> <span class="Function">canonicalize</span>(<span class="String">'..'</span>)
-pdirname <span class="Operator">:=</span> <span class="Function">replace_regex</span>(p2, <span class="String">'/([^/]*)$'</span>, <span class="String">'</span><span class="Constant">$1</span><span class="String">'</span>)
+pdirname <span class="Operator">:=</span> <span class="Function">replace_regex</span>(p2, <span class="String">'/([^/]*)$'</span>, <span class="String">'</span><span class="Identifier">$1</span><span class="String">'</span>)
 param <span class="Operator">:=</span> <span class="Function">semver_matches</span>(<span class="String">'0.1.1'</span>, <span class="String">'&gt;=0.1.0'</span>)
 
 <span class="Special">@</span><span class="Function">foo1</span> <span class="Identifier">param1</span> <span class="Identifier">param2</span><span class="Operator">=</span><span class="String">"default test"</span> <span class="Statement">+</span><span class="Identifier">varparam</span><span class="Operator">=</span><span class="String">'default'</span><span class="Operator">:</span> <span class="Function">dependency1</span> <span class="Delimiter">(</span><span class="Function">dependency2</span> p1 p2<span class="Delimiter">)</span> <span class="Delimiter">(</span><span class="Function">dependency3</span> param<span class="Delimiter">)</span>

tests/cases/replace_regex-captures.html

@@ -1,4 +1,4 @@
-foo <span class="Operator">:=</span> <span class="Function">replace_regex</span>(<span class="Function">justfile</span>(), <span class="String">'[^A-Za-z]([A-Za-z]+)\.just$'</span>, <span class="String">' - Test </span><span class="Constant">$1</span><span class="String">'</span>)
+foo <span class="Operator">:=</span> <span class="Function">replace_regex</span>(<span class="Function">justfile</span>(), <span class="String">'[^A-Za-z]([A-Za-z]+)\.just$'</span>, <span class="String">' - Test </span><span class="Identifier">$1</span><span class="String">'</span>)
 
 foo2 <span class="Operator">:=</span> <span class="Function">replace_regex</span>(<span class="String">"""</span>
 <span class="String">   </span><span class="Special">\t</span><span class="String">Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed</span>
@@ -9,38 +9,38 @@
 <span class="String">   quod angatur. Optime vero Epicurus, quod exiguam dixit</span>
 <span class="String">   fortunam intervenire sapienti maximasque ab eo dissentiunt,</span>
 <span class="String">   sed certe non.</span>
-<span class="String">"""</span>, <span class="String">'\W(?P&lt;Abc1_&gt;\w{2})\W'</span>, <span class="String">" _</span><span class="Constant">$Abc1_</span><span class="String">-"</span>)
+<span class="String">"""</span>, <span class="String">'\W(?P&lt;Abc1_&gt;\w{2})\W'</span>, <span class="String">" _</span><span class="Identifier">$Abc1_</span><span class="String">-"</span>)
 
-foo3 <span class="Operator">:=</span> <span class="Function">replace_regex</span>(<span class="Special">`echo ${HOME}`</span>, <span class="String">'/(\w+)/(\w+)'</span>, <span class="String">'</span><span class="Constant">${2}</span><span class="String">at</span><span class="Constant">${1}</span><span class="String">'</span>)
+foo3 <span class="Operator">:=</span> <span class="Function">replace_regex</span>(<span class="Special">`echo ${HOME}`</span>, <span class="String">'/(\w+)/(\w+)'</span>, <span class="String">'</span><span class="Identifier">${2}</span><span class="String">at</span><span class="Identifier">${1}</span><span class="String">'</span>)
 
 foo4 <span class="Operator">:=</span> <span class="Function">replace_regex</span>(<span class="String">'$T$es$t'</span>,
   <span class="String">'\$([tT])'</span>
   ,
-  <span class="String">'</span><span class="Constant">$1</span><span class="String">'</span>
+  <span class="String">'</span><span class="Identifier">$1</span><span class="String">'</span>
  )
 
 foo5 <span class="Operator">:=</span> <span class="Function">replace_regex</span>(<span class="String">"any</span><span class="Special">\n</span><span class="String">$123"</span>, <span class="String">'\$123'</span>, <span class="String">"""</span>
 <span class="Special">\t</span><span class="String">$$abc$</span>
 <span class="String">234</span><span class="Special">\</span>
-<span class="String">345 </span><span class="Constant">${456}</span><span class="String">567</span>
+<span class="String">345 </span><span class="Identifier">${456}</span><span class="String">567</span>
 <span class="String">"""</span>)
 
-foo6 <span class="Operator">:=</span> <span class="Function">replace_regex</span>(<span class="String">"Some text."</span>, <span class="String">'([^a-z])'</span>, <span class="String">'$$</span><span class="Constant">$1</span><span class="String">$$2'</span>)
+foo6 <span class="Operator">:=</span> <span class="Function">replace_regex</span>(<span class="String">"Some text."</span>, <span class="String">'([^a-z])'</span>, <span class="String">'$$</span><span class="Identifier">$1</span><span class="String">$$2'</span>)
 
 foo7 <span class="Operator">:=</span> <span class="Function">replace_regex</span>(<span class="String">"Some text."</span>, <span class="String">'([^a-z])'</span>, <span class="String">'$$1'</span>)
 
 foo8 <span class="Operator">:=</span> <span class="Function">replace_regex</span>(<span class="String">"test123"</span>, <span class="String">'\w(\d+)'</span>, <span class="String">'''</span>
-<span class="String">  \t'</span><span class="Constant">$1</span><span class="String">'''</span>)
+<span class="String">  \t'</span><span class="Identifier">$1</span><span class="String">'''</span>)
 
 foo9 <span class="Operator">:=</span> <span class="Function">replace_regex</span>(<span class="String">"trailing comma is accepted after the final argument,"</span>,
   <span class="String">"(</span><span class="Special">\\</span><span class="String">W+)"</span>, <span class="Special">\</span>
-  <span class="String">"</span><span class="Constant">${1}</span><span class="String">_</span><span class="Constant">$1</span><span class="String">"</span>,
+  <span class="String">"</span><span class="Identifier">${1}</span><span class="String">_</span><span class="Identifier">$1</span><span class="String">"</span>,
 )
 
 foo10 <span class="Operator">:=</span> <span class="Function">replace_regex</span>(<span class="String">"_abcdef"</span>,
   <span class="String">'(\w)[a-z]+'</span>, <span class="Special">\</span>
 
-  <span class="String">'</span><span class="Constant">${1}</span><span class="String">'</span>
+  <span class="String">'</span><span class="Identifier">${1}</span><span class="String">'</span>
   , <span class="Special">\</span>
 )
 
@@ -55,5 +55,5 @@
 replacement_split <span class="Operator">:=</span> <span class="Function">replace_regex</span>(<span class="String">'012034'</span>, <span class="String">'(?P&lt;capture&gt;[1-9]+)'</span>, <span class="String">"!$cap"</span> <span class="Operator">+</span> <span class="String">'ture'</span> <span class="Operator">+</span> <span class="String">'$captu'</span> <span class="Operator">/</span> <span class="String">"re"</span>)
 
 <span class="Function">replacement_in_interp</span><span class="Operator">:</span>
-<span class="Number">	echo </span><span class="String">'</span><span class="Delimiter">{{</span><span class="Function">replace_regex</span>(<span class="String">'A b c d'</span><span class="Normal">, </span><span class="String">'\s(\w)'</span><span class="Normal">, </span><span class="String">'1</span><span class="Constant">$1</span><span class="String">'</span>)<span class="Delimiter">}}</span><span class="String">'</span>
+<span class="Number">	echo </span><span class="String">'</span><span class="Delimiter">{{</span><span class="Function">replace_regex</span>(<span class="String">'A b c d'</span><span class="Normal">, </span><span class="String">'\s(\w)'</span><span class="Normal">, </span><span class="String">'1</span><span class="Identifier">$1</span><span class="String">'</span>)<span class="Delimiter">}}</span><span class="String">'</span>
 <span class="Number">	echo </span><span class="Delimiter">{{</span><span class="Function">replace_regex</span>(<span class="Identifier">replacement_conditional</span><span class="Normal">, </span><span class="String">'(\d+)'</span><span class="Normal">, </span><span class="Identifier">foo3</span>)<span class="Delimiter">}}</span>

tests/cases/tricky.html

@@ -36,7 +36,7 @@
 not_a_uuid_anymore <span class="Operator">:=</span> <span class="Function">replace_regex</span>  (
     <span class="Function">uuid</span>	(
   ), <span class="String">'-4([0-9A-Fa-f]{3})-'</span>
-, <span class="String">'_9</span><span class="Constant">${1}</span><span class="String">_'</span>
+, <span class="String">'_9</span><span class="Identifier">${1}</span><span class="String">_'</span>
 )
 
 conditional_without_indent <span class="Operator">:=</span> <span class="Conditional">if</span> <span class="Function">env</span>(<span class="String">'SHELL'</span>) <span class="Operator">==</span> <span class="String">'/bin/bash'</span> {