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Regex Tester Online Free

Test regular expressions against text and see matches highlighted.

manage_search Regex Tester Online Free
verified_user Your files are processed only as needed and are not stored after the tool finishes.
Debug and test JavaScript regular expressions in real time. Enter a pattern, choose flags (g, i, m, s, u, y), paste test text, and see every match with its index and capture groups instantly. No page reloads — results update as you type.

Frequently Asked Questions

Which regex flavor does this use? expand_more
JavaScript's built-in RegExp engine. Patterns are evaluated with the flags you specify (default: gi).
What flags are supported? expand_more
g (global), i (case-insensitive), m (multiline), s (dotAll), u (unicode), and y (sticky) — the full set of JavaScript RegExp flags.

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