Tiny Toolkit

Regex Tester

Write a regular expression, configure your flags, and test it against a sample string with live match highlighting and a detailed match table showing index, matched text, and capture groups. Pattern errors are caught and explained in real time. A fast way to build and verify regular expressions before dropping them into code.

All processing happens in your browser. No data is sent to any server.

Frequently Asked Questions

What regex engine does this tool use?
The tool uses JavaScript's built-in RegExp engine, which follows the ECMAScript specification.
What flags can I toggle?
Global (g), case-insensitive (i), multiline (m), and dot-all (s) flags can each be toggled independently.
How do I match a pattern across multiple lines?
Enable the multiline (m) flag for ^ and $ to match line boundaries. Enable dot-all (s) to make . match newline characters as well.

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