Support u flag for regexp

Fixes #513

Author: mjbvz

TypeScript.YAML-tmLanguage

@@ -1834,7 +1834,7 @@ repository:
   regex:
     patterns:
     - name: string.regexp.ts
-      begin: (?<=[=(:,\[?+!]|return|case|=>|&&|\|\||\*\/)\s*(\/)(?![\/*])(?=(?:[^\/\\\[]|\\.|\[([^\]\\]|\\.)+\])+\/(?![\/*])[gimy]*(?!\s*[a-zA-Z0-9_$]))
+      begin: (?<=[=(:,\[?+!]|return|case|=>|&&|\|\||\*\/)\s*(\/)(?![\/*])(?=(?:[^\/\\\[]|\\.|\[([^\]\\]|\\.)+\])+\/(?![\/*])[gimuy]*(?!\s*[a-zA-Z0-9_$]))
       beginCaptures:
         '1': {name: punctuation.definition.string.begin.ts}
       end: (/)([gimuy]*)

TypeScript.tmLanguage

@@ -4994,7 +4994,7 @@
             <key>name</key>
             <string>string.regexp.ts</string>
             <key>begin</key>
-            <string>(?&lt;=[=(:,\[?+!]|return|case|=&gt;|&amp;&amp;|\|\||\*\/)\s*(\/)(?![\/*])(?=(?:[^\/\\\[]|\\.|\[([^\]\\]|\\.)+\])+\/(?![\/*])[gimy]*(?!\s*[a-zA-Z0-9_$]))</string>
+            <string>(?&lt;=[=(:,\[?+!]|return|case|=&gt;|&amp;&amp;|\|\||\*\/)\s*(\/)(?![\/*])(?=(?:[^\/\\\[]|\\.|\[([^\]\\]|\\.)+\])+\/(?![\/*])[gimuy]*(?!\s*[a-zA-Z0-9_$]))</string>
             <key>beginCaptures</key>
             <dict>
               <key>1</key>

TypeScriptReact.tmLanguage

@@ -4940,7 +4940,7 @@
             <key>name</key>
             <string>string.regexp.tsx</string>
             <key>begin</key>
-            <string>(?&lt;=[=(:,\[?+!]|return|case|=&gt;|&amp;&amp;|\|\||\*\/)\s*(\/)(?![\/*])(?=(?:[^\/\\\[]|\\.|\[([^\]\\]|\\.)+\])+\/(?![\/*])[gimy]*(?!\s*[a-zA-Z0-9_$]))</string>
+            <string>(?&lt;=[=(:,\[?+!]|return|case|=&gt;|&amp;&amp;|\|\||\*\/)\s*(\/)(?![\/*])(?=(?:[^\/\\\[]|\\.|\[([^\]\\]|\\.)+\])+\/(?![\/*])[gimuy]*(?!\s*[a-zA-Z0-9_$]))</string>
             <key>beginCaptures</key>
             <dict>
               <key>1</key>

tests/baselines/Issue513.baseline.txt

@@ -0,0 +1,22 @@
+original file
+-----------------------------------
+(/a/u);
+-----------------------------------
+
+Grammar: TypeScript.tmLanguage
+-----------------------------------
+>(/a/u);
+ ^
+ source.ts meta.brace.round.ts
+  ^
+  source.ts string.regexp.ts punctuation.definition.string.begin.ts
+   ^
+   source.ts string.regexp.ts
+    ^
+    source.ts string.regexp.ts punctuation.definition.string.end.ts
+     ^
+     source.ts string.regexp.ts keyword.other.ts
+      ^
+      source.ts meta.brace.round.ts
+       ^
+       source.ts punctuation.terminator.statement.ts

tests/cases/Issue513.ts

@@ -0,0 +1 @@
+(/a/u);