Regex is a regular-expression testing tool that is easy to use.
Features - Immediate feedback. Dynamic highlighting of matches as you modify the regular expression or sample text - Automatic escaping of special characters when copying a regular expression - Automatic unescaping of special characters when pasting a regular expression - Supports capture groups - Supports matching options such as case-insensitive matches - Supports positive lookahead, negative lookahead - Supports positive lookbehind, negative lookbehind - Supports backreferences - Fast and dead-simple to use