Any time I want to write some non trivial regex I use https://debuggex.com/ https://debuggex.com/ to check/write it. It is also great to quickly find out what a

Any time I want to write some non trivial regex I use https://debuggex.com/ https://debuggex.com/ to check/write it. It is also great to quickly find out what a regular expression that someone else write actually does.