How can test I regular expressions using multiple RE engines? [closed]

The most powerful free online regexp testing tool is by far http://regex101.com/ – lets you select the RE engine (PCRE, JavaScript, Python), has a debugger, colorizes the matches, explains the regexp on the fly, can create permalinks to the regex playground. Other online tools: http://www.rexv.org/ – supports PHP and Perl PCRE, Posix, Python, JavaScript, and … Read more