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Regex Tester

Regex Tester lets you write a regular expression and see all matches highlighted in real time against test text, with support for flags like global, multiline, and case-insensitive.

No upload Instant Free No sign-up
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Enter a pattern to start matching

How to use the regex tester

  1. 1 Enter your regular expression pattern (without wrapping slashes) in the Pattern field.
  2. 2 Set flags as needed: g (global), i (case-insensitive), m (multiline).
  3. 3 Type or paste test text and all matches are highlighted instantly.

Frequently Asked Questions

Is my text or regex sent anywhere?
No — all matching runs entirely in your browser using the built-in JavaScript RegExp engine. Nothing is uploaded.
What regex syntax is supported?
JavaScript's ECMAScript regex syntax: character classes, quantifiers, anchors, groups, lookaheads, and named capture groups are all supported.
Why are there no match results?
Check that your pattern is valid and that the global (g) flag is enabled if you expect multiple matches.
How do I test a multiline pattern?
Enable the m flag — it makes ^ and $ match the start and end of each line rather than the whole string.

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