RegexKitLite replace url with html link

Question

This isn't working for some reason it just crashes my app:

NSString *urlRegex = @"\\bhttps?://[a-zA-Z0-9\\-.]+(?:(?:/[a-zA-Z0-9\\-._?,'+\\&%$=~*!():@\\\\]*)+)?";

NSString *urlParsedStatus = [status stringByReplacingOccurrencesOfRegex:urlRegex withString:@"<a href=\"$1\">$1</a>"];

NSLog(@"new string: %@", urlParsedStatus);  

any idea why this isn't working?

Thanks