Regex Tester
Test regular expression matches and replacements online with presets and highlighted results.
Enter a regular expression and test text to inspect highlighted matches, match count, and replacement preview.
Useful for logs, form validation, text extraction, and quick pattern checks. No remote code is executed.
Common regex:
Highlighted Matches
Replacement Preview
Was this tool helpful?
Your feedback helps us decide which tools to improve first.
If you can, tell us the main reason:
Common use cases
- Use this page when writing validation, log filtering, or text extraction patterns and you want to confirm the matches quickly.
- It is useful for checking email, URL, date, and phone-number patterns before using them in code or documentation.
- When you need replacement output for masking, cleanup, or format changes, the preview helps catch mistakes before copying the rule.