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

"Online regex tester, debugger with highlighting for PHP, PCRE, Python, Golang and JavaScript."

I never do regex enough to become an expert, but when I had to debug an expression that apparently was using syntax too new for Firefox I discovered this site. A great way to investigate, debug and author regex expression for people like me who are not masters of the art of regular expressions.

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