simplify regex to reduce exponential backtracking (#23047)

examples/jsm/loaders/VRMLLoader.js

@@ -192,7 +192,7 @@ class VRMLLoader extends Loader {
 
 			//
 
-			const StringLiteral = createToken( { name: 'StringLiteral', pattern: /"(:?[^\\"\n\r]|\\(:?[bfnrtv"\\/]|u[0-9a-fA-F]{4}))*"/ } );
+			const StringLiteral = createToken( { name: 'StringLiteral', pattern: /"(?:[^\\"\n\r]|\\[bfnrtv"\\/]|\\u[0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F])*"/ } );
 			const HexLiteral = createToken( { name: 'HexLiteral', pattern: /0[xX][0-9a-fA-F]+/ } );
 			const NumberLiteral = createToken( { name: 'NumberLiteral', pattern: /[-+]?[0-9]*\.?[0-9]+([eE][-+]?[0-9]+)?/ } );
 			const TrueLiteral = createToken( { name: 'TrueLiteral', pattern: /TRUE/ } );