Regex Validator
Test and debug regular expressions with live matching.
Regular Expression Pattern
Test String
📚 Common Patterns:
About Regex Validator
Regex Validator lets you write a regular expression and test it against sample text in real time, highlighting all matches as you type. It supports JavaScript regex syntax including flags like global, case-insensitive, multiline, and sticky. You can also inspect individual capture groups to understand exactly what each part of your pattern is matching.
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Frequently Asked Questions
Is Regex Validator free?
Yes, completely free. No signup, no account, no usage limits. Use it as much as you need.
Is my data secure?
All processing happens directly in your browser using JavaScript. Your data is never sent to any server, stored, or shared. It stays entirely on your device.
Which regex flavor does the tool use?
The tool uses JavaScript (ECMAScript) regular expression syntax, which is the same engine used in Node.js and all modern browsers.
Can I see all capture group values for each match?
Yes. When your regex contains named or numbered capture groups, each match is expanded to show the value captured by each group.