Regex Tester
Test and debug regular expressions
About Regex Tester
Test regular expressions against sample text with real-time matching. See all matches highlighted, capture groups extracted, and get explanations for your patterns. Supports JavaScript regex syntax. Use this regex tester for regex, regular expression, pattern, match. Built for developer workflows with practical output quality. Key capabilities include Real-time pattern matching, Highlight all matches, Extract capture groups. Runs securely in your browser with no installation and no account required.
This free online regex tester runs directly in your browser with no installation required. It is designed for users searching for accurate results, fast processing, and privacy-first workflows.
g Globali Case insensitivem MultilineWhy use this regex tester?
Use this tool to complete regex tester workflows quickly and accurately without sending data to third-party services. It is designed for practical browser-based usage and reliable output.
- Real-time pattern matching
- Highlight all matches
- Extract capture groups
- Common pattern library
- Flags support (g, i, m)
Frequently Asked Questions
What regex flavor does this use?
This tool uses JavaScript regular expressions, which are based on Perl regex syntax with some differences.
How do capture groups work?
Parentheses () create capture groups that extract matched substrings. Access them with $1, $2, etc. in replacements.
Common use cases
Teams and individuals use this regex tester for debugging, validation, data cleanup, testing, and repeatable browser-based workflows.
Because it runs directly in your browser, it helps reduce setup time and speeds up tasks that would otherwise require scripts, local tooling, or external SaaS utilities.