Fix the regexp determination lookup

Author: sheetalkamat

TypeScript.YAML-tmLanguage

@@ -1609,7 +1609,7 @@ repository:
   regex:
     patterns:
     - name: string.regex.ts
-      begin: (?<=[=(:,\[?+!]|return|case|=>|&&|\|\||\*\/)\s*(/)(?![/*+?])(?=.*/)
+      begin: (?<=[=(:,\[?+!]|return|case|=>|&&|\|\||\*\/)\s*(/)(?![/*])(?=(?:[^/\\\[]|\\.|\[([^\]\\]|\\.)+\])+/(?![/*])[gimy]*(?!\s*[a-zA-Z0-9_$]))
       beginCaptures:
         '1': {name: punctuation.definition.string.begin.ts}
       end: (/)([gimuy]*)

TypeScript.tmLanguage

@@ -4396,7 +4396,7 @@
             <key>name</key>
             <string>string.regex.ts</string>
             <key>begin</key>
-            <string>(?&lt;=[=(:,\[?+!]|return|case|=&gt;|&amp;&amp;|\|\||\*\/)\s*(/)(?![/*+?])(?=.*/)</string>
+            <string>(?&lt;=[=(:,\[?+!]|return|case|=&gt;|&amp;&amp;|\|\||\*\/)\s*(/)(?![/*])(?=(?:[^/\\\[]|\\.|\[([^\]\\]|\\.)+\])+/(?![/*])[gimy]*(?!\s*[a-zA-Z0-9_$]))</string>
             <key>beginCaptures</key>
             <dict>
               <key>1</key>

TypeScriptReact.tmLanguage

@@ -4378,7 +4378,7 @@
             <key>name</key>
             <string>string.regex.tsx</string>
             <key>begin</key>
-            <string>(?&lt;=[=(:,\[?+!]|return|case|=&gt;|&amp;&amp;|\|\||\*\/)\s*(/)(?![/*+?])(?=.*/)</string>
+            <string>(?&lt;=[=(:,\[?+!]|return|case|=&gt;|&amp;&amp;|\|\||\*\/)\s*(/)(?![/*])(?=(?:[^/\\\[]|\\.|\[([^\]\\]|\\.)+\])+/(?![/*])[gimy]*(?!\s*[a-zA-Z0-9_$]))</string>
             <key>beginCaptures</key>
             <dict>
               <key>1</key>