Fix the as operator detection

Fixes #500

Author: sheetalkamat

TypeScript.YAML-tmLanguage

@@ -1680,7 +1680,7 @@ repository:
     - begin: (?<!\.|\$)\b(as)\s+
       beginCaptures:
         '1': { name: keyword.control.as.ts }
-      end: (?=$|^|[;,:})\]])
+      end: (?=$|^|[;,:})\]]|((?<!\.|\$)\b(as)\s+))
       patterns:
       - include: '#type'
     - name: keyword.operator.spread.ts

TypeScript.tmLanguage

@@ -4617,7 +4617,7 @@
               </dict>
             </dict>
             <key>end</key>
-            <string>(?=$|^|[;,:})\]])</string>
+            <string>(?=$|^|[;,:})\]]|((?&lt;!\.|\$)\b(as)\s+))</string>
             <key>patterns</key>
             <array>
               <dict>

TypeScriptReact.tmLanguage

@@ -4563,7 +4563,7 @@
               </dict>
             </dict>
             <key>end</key>
-            <string>(?=$|^|[;,:})\]])</string>
+            <string>(?=$|^|[;,:})\]]|((?&lt;!\.|\$)\b(as)\s+))</string>
             <key>patterns</key>
             <array>
               <dict>

tests/baselines/Issue500.baseline.txt

@@ -0,0 +1,28 @@
+original file
+-----------------------------------
+0 as any as string;
+-----------------------------------
+
+Grammar: TypeScript.tmLanguage
+-----------------------------------
+>0 as any as string;
+ ^
+ source.ts constant.numeric.decimal.ts
+  ^
+  source.ts
+   ^^
+   source.ts keyword.control.as.ts
+     ^
+     source.ts
+      ^^^
+      source.ts support.type.primitive.ts
+         ^
+         source.ts
+          ^^
+          source.ts keyword.control.as.ts
+            ^
+            source.ts
+             ^^^^^^
+             source.ts support.type.primitive.ts
+                   ^
+                   source.ts punctuation.terminator.statement.ts

tests/cases/Issue500.ts

@@ -0,0 +1 @@
+0 as any as string;