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Regular expression (RegExp) testers (editors) online tools! The Best!

Online regex tester and debugger: JavaScript, Python, PHP, and PCRE  - my favorite regexp checker RegExr: Learn, Build, & Test RegEx Debuggex: Online visual regex tester. JavaScript, Python, and PCRE.   Regex Tester and Debugger Online - Javascript, PCRE, PHP   Free Online Regular Expression Tester - FreeFormatter.com (and tons of other online web tools)  вот ещё хороший regexp cheatsheet (eng.)