Online regex tester and debugger: PHP, PCRE, Python, Golang and JavaScript

Regex101 allows you to create, debug, test and have your expressions explained for PHP, PCRE, Python, Golang and JavaScript. The website also features a community where you can share useful expressions.

Source: Online regex tester and debugger: PHP, PCRE, Python, Golang and JavaScript

This site is really handy if you want to test and debug regex statements before committing them to code.