Regex Tester (Free)
This free regex tester runs entirely in your browser — no signup and no file uploads. Test regular expressions against sample text with match highlighting and common flag support.
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Matches (3)
- [0] Hello
- [6] world
- [12] 123
How to use this free tool
- Enter a pattern.
- Paste sample text.
- Toggle flags as needed.
- Review matches and adjust.
Examples
Email-ish match
Input: pattern: \w+@\w+\.\w+
Output: Highlights matching spans
Related searches
People looking for a regex tester often also search for regular expression tester, regexp online, pattern matcher, regex debugger, regexp tester, and regular expression. This page covers that search cluster without duplicate URLs.
FAQ
Which regex flavor is used?
JavaScript RegExp semantics in the browser.
Can I use flags?
Yes—common flags like g, i, and m are supported.
Does it explain the pattern?
Focus is on match results; refine your pattern iteratively.
How do I use a free regex tester?
This free regex tester runs entirely in your browser — no signup and no file uploads. Use the free tool above for instant results — no signup, browser-based, and private.
What is a regex tester?
This free regex tester runs entirely in your browser — no signup and no file uploads. Use the free tool above for instant results — no signup, browser-based, and private.
Is there a free online tool for regex tester?
This free regex tester runs entirely in your browser — no signup and no file uploads. Use the free tool above for instant results — no signup, browser-based, and private.
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