ERB: Fixed another case of exp backtracking

Author: RunDevelopment

components/prism-erb.js

@@ -9,7 +9,7 @@
 	});
 
 	Prism.hooks.add('before-tokenize', function (env) {
-		var erbPattern = /<%=?(?:[^\r\n]|[\r\n](?!=begin)|[\r\n]=begin\s[\s\S]*?^=end)+?%>/gm;
+		var erbPattern = /<%=?(?:[^\r\n]|[\r\n](?!=begin)|[\r\n]=begin\s(?:[^\r\n]|[\r\n](?!=end))*[\r\n]=end)+?%>/gm;
 		Prism.languages['markup-templating'].buildPlaceholders(env, 'erb', erbPattern);
 	});