How to test a regular expression
Regex is easiest to get right with instant feedback. Here's how to test a pattern against sample text.
Steps
- Open the regex tester and enter your pattern.
- Paste sample text to match against.
- Matches highlight live; capture groups are listed.
- Toggle flags (g, i, m, s, u) to refine the behavior.
Which flavor
The tester uses JavaScript's RegExp engine — the same one that runs in browsers and Node — so what you see here is exactly how your pattern behaves in JS code.
Tools used in this guide
Related guides
How to test a regular expression — FAQ
Enter the pattern and sample text in the tester — matches highlight live and capture groups are shown.