Regex Tester
Test a regular expression against your own sample text and see every match instantly, without needing to run any code.
About this regex tester
Regular expressions are powerful but notoriously easy to get subtly wrong. This tool lets you iterate on a pattern against real sample text and see matches immediately, much faster than testing inside actual code.
How regex tester works
Your regular expression is compiled using standard JavaScript regex syntax and applied globally against your sample text, with every match extracted and listed.
Common uses
- Debugging why a regex pattern isn't matching as expected
- Building a validation pattern for a form field
- Extracting specific data from a block of text
How to use this tool
- Paste your sample text.
- Enter your regular expression.
- Click Process to see every match.
What to know before using it
Uses JavaScript's regex engine specifically, syntax can differ slightly from other languages like Python or PCRE in edge cases (such as lookbehind support in older engines).
Privacy and browser-first processing
Your text and pattern are processed entirely in your browser and are never uploaded or stored.
Frequently asked questions
What regex flavor does this use?
Standard JavaScript regular expression syntax, the same engine used in browsers and Node.js.