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Regex Tester
Test regular expressions with live match highlighting, capture groups, and flag controls.
Frequently Asked Questions
What regex flavor does this use?
It uses JavaScript's built-in RegExp engine, which supports most common regex features including lookahead, lookbehind, named groups, and Unicode.
Can I use regex flags?
Yes — toggle global (g), case-insensitive (i), and multiline (m) flags using the checkboxes.
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