Regex Tester
Test regular expressions against sample text with live match highlighting.
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What is Regex Tester?
A regex tester lets you validate patterns against sample strings before using them in code or search-and-replace.
How to use
Enter your regex pattern and flags.
Paste test text.
Review matches and groups.
Benefits
- Live match feedback
- Supports common flags
- Debug patterns quickly
Frequently Asked Questions
Is this tool free?
Yes. This tool is completely free to use with no sign-up, no limits, and no hidden fees.
Does my data leave my browser?
No. All processing happens entirely in your browser using client-side JavaScript. Your data is never sent to a server or stored anywhere.
Feedback & report a problem
Found a bug or have a suggestion? Let us know — it helps us improve this tool.
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