[gtksourceview: 2/9] css.lang (and family): Clean up regular expression groups

[Christian Hergert <chergert src gnome org>]

commit 1f50e98c77a645257fd59728e4978b2b57ce268b
Author: Jeffery To <jeffery to gmail com>
Date:   Tue Jun 2 01:25:15 2020 +0800

    css.lang (and family): Clean up regular expression groups
    
    * Remove unnecessary groups
    * Prefer non-capturing groups

 data/language-specs/css.lang  |  4 ++--
 data/language-specs/less.lang | 16 +++++++---------
 data/language-specs/scss.lang | 20 +++++++++-----------
 3 files changed, 18 insertions(+), 22 deletions(-)
---
diff --git a/data/language-specs/css.lang b/data/language-specs/css.lang
index 3b2b02f9..15e59e18 100644
--- a/data/language-specs/css.lang
+++ b/data/language-specs/css.lang
@@ -280,7 +280,7 @@
     </context>
 
     <context id="hexadecimal-color" style-ref="color">
-      <match>#([a-f0-9]{8}|[a-f0-9]{6}|[a-f0-9]{4}|[a-f0-9]{3})\%]</match>
+      <match>#(?:[a-f0-9]{8}|[a-f0-9]{6}|[a-f0-9]{4}|[a-f0-9]{3})\%]</match>
     </context>
 
     <context id="css3-named-color" style-ref="color">
@@ -2507,7 +2507,7 @@
 
     <context id="nth-pseudo-class" end-parent="true">
       <start extended="true">
-        \%[ (nth-child | nth-of-type | nth-last-child | nth-last-of-type) \(
+        \%[ (?: nth-child | nth-of-type | nth-last-child | nth-last-of-type ) \(
       </start>
       <end>\)</end>
       <include>
diff --git a/data/language-specs/less.lang b/data/language-specs/less.lang
index bedfd061..5d11a679 100644
--- a/data/language-specs/less.lang
+++ b/data/language-specs/less.lang
@@ -62,7 +62,7 @@
     <!-- global -->
 
     <define-regex id="identifier">[\w-]+</define-regex>
-    <define-regex id="statement-end" extended="true">;|(?=})</define-regex>
+    <define-regex id="statement-end">;|(?=})</define-regex>
 
     <context id="embedded-lang-hook"/>
 
@@ -152,12 +152,10 @@
          also not sure what are Less' rules regarding hyphen vs subtraction -->
     <context id="arithmetic-operator" style-ref="operator-symbol">
       <match extended="true">
-        (
-          [+*/] |
-          (?&lt;! \%{css:single-identifier-char} )
-          -
-          (?! \%{css:single-identifier-char} )
-        )
+        [+*/] |
+        (?&lt;! \%{css:single-identifier-char} )
+        -
+        (?! \%{css:single-identifier-char} )
       </match>
     </context>
 
@@ -495,7 +493,7 @@
           )
         )
 
-        (
+        (?:
           \+_?: |  # property merge
           :
           (?:
@@ -750,7 +748,7 @@
     </context>
 
     <context id="guard-comparison-operator" style-ref="operator-symbol">
-      <match>(&gt;=?|=&lt;?|&lt;)</match>
+      <match>&gt;=?|=&lt;?|&lt;</match>
     </context>
 
     <context id="guard-test">
diff --git a/data/language-specs/scss.lang b/data/language-specs/scss.lang
index 5d7ee953..9a3024c3 100644
--- a/data/language-specs/scss.lang
+++ b/data/language-specs/scss.lang
@@ -133,12 +133,10 @@
          a division operation -->
     <context id="arithmetic-operator" style-ref="operator-symbol">
       <match extended="true">
-        (
-          [+*%] |
-          (?&lt;! \%{css:single-identifier-char} )
-          -
-          (?! \%{css:single-identifier-char} )
-        )
+        [+*%] |
+        (?&lt;! \%{css:single-identifier-char} )
+        -
+        (?! \%{css:single-identifier-char} )
       </match>
     </context>
 
@@ -147,7 +145,7 @@
     </context>
 
     <context id="comparison-operator" style-ref="operator-symbol">
-      <match>(&lt;=?|&gt;=?|[=!]=)</match>
+      <match>&lt;=?|&gt;=?|[=!]=</match>
     </context>
 
     <context id="logical-operator" style-ref="logical-operator">
@@ -688,7 +686,7 @@
     -->
 
     <context id="at-debug-warn-error">
-      <start>@(debug|warn|error)\%]</start>
+      <start>@(?:debug|warn|error)\%]</start>
       <include>
         <context sub-pattern="0" where="start" style-ref="css:at-rule"/>
         <context ref="css:embedded-lang-hook"/>
@@ -705,7 +703,7 @@
     -->
 
     <context id="at-if-else-if">
-      <start>@(if|else\s+if)\%]</start>
+      <start>@(?:if|else\s+if)\%]</start>
       <include>
         <context sub-pattern="0" where="start" style-ref="css:at-rule"/>
         <context ref="css:embedded-lang-hook"/>
@@ -954,8 +952,8 @@
     <context id="parent-combinator">
       <match>(&amp;)(\%{css:identifier-chars}?)</match>
       <include>
-        <context sub-pattern="1"  style-ref="css:combinator"/>
-        <context sub-pattern="2"  style-ref="selector-fragment"/>
+        <context sub-pattern="1" style-ref="css:combinator"/>
+        <context sub-pattern="2" style-ref="selector-fragment"/>
       </include>
     </context>