Regex Tester
Test regular expressions against sample text.
About Regex Tester
Test regular expressions against sample text before you ship validation rules. This regex tester helps you iterate on patterns for forms, parsers, and log extraction with immediate match feedback.
How to use this tool
- Enter your regular expression pattern.
- Paste representative sample text.
- Run the tester and inspect matches/groups.
- Copy the final pattern into your codebase or docs.
What you get
- Interactive match feedback
- Great for validation prototyping
- Browser-based and free
Common use cases
- Prototype email/phone validators
- Extract fields from log lines
- Document patterns for code review
Frequently asked questions
Which regex flavor is used?
Browser JavaScript regex semantics apply for client-side testing.
Can I test flags?
Use the options exposed in the tool UI for common flags while iterating.
Is it free?
Yes — free online regex testing on CodeForge Tools.