UtilStore

Regex Tester

Test regular expressions

Text & Code Tools

Regex Tester

Test your regular expressions against a string with real-time matching

//gi

Test String

Result

0 matches found
The quick brown fox jumps over the lazy dog.

What is a Regex Tester?

A regex tester lets you write and test regular expressions against sample text in real time. Matches are highlighted instantly as you type, with support for common flags like global, case-insensitive, and multiline. Perfect for building and debugging patterns for validation, search, or data extraction.

Frequently Asked Questions

Which regex flavor is used?

JavaScript regex engine, which supports lookahead, lookbehind, named groups, and Unicode.

Does it support flags?

Yes — global (g), case-insensitive (i), multiline (m), dotAll (s), and Unicode (u).

Is my data sent anywhere?

No. Everything runs locally in your browser.

Detailed Guide & Usage

A regex tester lets you write and test regular expressions against sample text in real time. Matches are highlighted instantly as you type, with support for common flags like global, case-insensitive, and multiline. Perfect for building and debugging patterns for validation, search, or data extraction.

How to Use:

  1. Type your Regular Expression in the pattern field.
  2. Select flags like /g (global) or /i (case-insensitive).
  3. Enter test strings in the main text area.
  4. Review the highlighted matches and capture groups.

FAQ

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