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

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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:

Windows desktop tools:

Jeff Atwood [wrote about regular expressions]( post:).

Other tools recommended by SO users include:

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