JavaScript: Reduced backtracking in regex pattern. Fix #1159

Author: Golmote

components/prism-javascript.js

@@ -8,7 +8,7 @@ Prism.languages.javascript = Prism.languages.extend('clike', {
 
 Prism.languages.insertBefore('javascript', 'keyword', {
 	'regex': {
-		pattern: /(^|[^/])\/(?!\/)(\[.+?]|\\.|[^/\\\r\n])+\/[gimyu]{0,5}(?=\s*($|[\r\n,.;})]))/,
+		pattern: /(^|[^/])\/(?!\/)(\[[^\]\r\n]+]|\\.|[^/\\\[\r\n])+\/[gimyu]{0,5}(?=\s*($|[\r\n,.;})]))/,
 		lookbehind: true,
 		greedy: true
 	}

components/prism-javascript.min.js

@@ -699,7 +699,7 @@ Prism.languages.javascript = Prism.languages.extend('clike', {
 
 Prism.languages.insertBefore('javascript', 'keyword', {
 	'regex': {
-		pattern: /(^|[^/])\/(?!\/)(\[.+?]|\\.|[^/\\\r\n])+\/[gimyu]{0,5}(?=\s*($|[\r\n,.;})]))/,
+		pattern: /(^|[^/])\/(?!\/)(\[[^\]\r\n]+]|\\.|[^/\\\[\r\n])+\/[gimyu]{0,5}(?=\s*($|[\r\n,.;})]))/,
 		lookbehind: true,
 		greedy: true
 	}