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Free Regex Tester - Use Online Without Installing

Web

Test regular expressions against sample text

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How to Use

  1. 1Enter a regular expression and flags.
  2. 2Paste sample text and inspect highlighted matches.

About This Tool

Test regular expressions against sample text. Enter a regular expression and flags.

Good to know

Certain patterns can become very slow on long text. Test potentially untrusted patterns on a small sample first.

Worked Example and Result Check

Try a pattern against sample input and inspect exactly which characters matched.

Add edge cases; passing a few examples does not prove a pattern validates all real data.