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Enter a regex and text, then click "Test match"
Regex Tester Guide
1
Type your expression in the regex box and tick the g/i/m/s flags you need
2
Paste text into the test box and click "Test match" to see highlights and match count
3
Check the capture groups for each match below, or enter a replacement and run replace
📌Common regex examples
- Email: [\w.-]+@[\w.-]+\.\w+
- US phone: \d{3}-\d{3}-\d{4}
- URL: https?:\/\/[^\s]+
💡Tips
- Turn on the g flag to match everything at once; without it only the first match is found
- Use parentheses ( ) to make capture groups, then reference them with $1, $2 in the replacement
- Invalid patterns show an error message — check that brackets and escapes are balanced
A regular expression is a powerful syntax for describing text patterns, widely used for search, validation and replacement. This tool runs your regex live with the browser native RegExp so you can verify as you write.
🔒 Runs entirely locally in your browser, neither the regex nor the test text is uploaded; supports match highlighting, capture groups and replace preview — no install, no signup.