I’ve just came across a new tool that you might find handy:

https://regexr.com/ - a nice online tool for generating regular expressions ;)

Keep in mind while using this:

While the core feature set of regular expressions is fairly consistent, different implementations (ex. Perl vs Java) may have different features or behaviors.

RegExr uses your browser’s RegExp engine for matching, and its syntax highlighting and documentation reflect the JavaScript RegExp standard.