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Regex Tester

Regex Tester

Test a regular expression against sample text with live highlighting.

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About this tool

Enter a regular expression pattern, flags and a test string to see every match highlighted inline, plus a list of matches with their index and captured groups. Invalid patterns are caught and explained rather than crashing silently.

Examples

  • Pattern \b\w+@\w+\.\w+\b against "email me at a@b.com" highlights "a@b.com".

Frequently asked questions

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