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Test JavaScript regular expressions against sample text with visible match results.
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Check a pattern in the browser's JavaScript regex engine before moving it into your code. Flags affect matching behavior, so keep them visible while comparing examples. Include edge cases that should not match as well as expected successes.
Test ^cat$ with and without the multiline flag against a three-line sample to inspect how anchors behave.
Results follow the current browser's JavaScript regex support. Other engines, including PCRE and Python, can interpret patterns differently.
Enter a regular expression and select its flags. Paste representative matching and non-matching text. Inspect highlighted matches, groups, and replacement behavior when needed.
Results follow the current browser's JavaScript regex support. Other engines, including PCRE and Python, can interpret patterns differently.
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