Debuggex: Online visual regex tester. JavaScript, Python, and PCRE.
Posted by jpluimers on 2018/01/18
On my list of things to try out when I need to use regular expressions again:
Test your regex by visualizing it with a live editor. JavaScript, Python, and PCRE.
Source: Debuggex: Online visual regex tester. JavaScript, Python, and PCRE.
Via: [WayBack] Sergiu Toarca answering [WayBack] Regex lookahead with multiple negative conditions – Stack Overflow
Note: in January 2018, Debuggex was down for a few days (Thanks Uwe for bringing that up and giving the below alternative [WayBack]).
If you are on Windows and are OK with a small cost, try this instead: [WayBack] RegexBuddy: Learn, Create, Understand, Test, Use and Save Regular Expression
–jeroen
The Wiert Corner - irregular stream of stuff 
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