Inspect the result
Review matched text, numbered capture groups, and source ranges.
Regex Match Lab
Check the match.
Keep the edge cases.
See matches, capture groups, and replacement previews alongside the examples your regex needs to handle.
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Test the exceptions
Mark examples Should match or Should not match, then run them together.
Save the whole test
Keep patterns, samples, flags, replacements, and examples locally. Back up and restore JSON copies.
Before you begin
Know what to expect.
Test cases look for a match anywhere in the example. Anchor the pattern when checking the entire text. Large inputs and result counts have limits; no automatic sync is included.
Check the match. Keep the edge cases.
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