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What it does
Test patterns against sample text with match highlighting. Part of Developer Tools — Format, validate, encode, and inspect.
When to use it
Test an email-validation pattern against 20 samples with match highlighting.
Privacy & safety
Parses and formats locally; scripts are never executed. Paste only code you are allowed to share with your own machine.
This tool works on text you paste — nothing leaves the page until you copy or save it yourself.
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