Regex Tester & Debugger
Test regular expressions with live matching, capture groups, and flag support. See matches highlighted in real-time as you type.
About Regex Tester & Debugger
Punchbit Regex Tester is a free browser-based tool for testing and debugging regular expressions. It provides live matching with highlighted results, capture group inspection, and support for all JavaScript regex flags (g, i, m, s, u, y). No data is sent to any server.
Key Features
- -Live regex matching with highlighted results
- -Capture group inspection and debugging
- -All JavaScript regex flags supported (g, i, m, s, u, y)
- -Real-time pattern validation
- -No data sent to servers
Common Use Cases
- -Testing patterns for form validation
- -Debugging complex regex for log parsing
- -Learning regular expression syntax
- -Extracting data from structured text
- -Building search and replace patterns
Regex Tester & Debugger is a free tool by Punchbit. Available at punchbit.com/tools/regex-tester. No signup required.
Frequently Asked Questions
›How do I test a regular expression?
Enter your regex pattern in the Pattern field, set your flags (g for global, i for case-insensitive, m for multiline), and paste your test string below. Matches appear instantly.
›What regex flags are supported?
All standard JavaScript flags: g (global), i (case-insensitive), m (multiline), s (dotAll), u (unicode), and y (sticky).
›Does this show capture groups?
Yes. Each match shows its capture groups (parenthesized subexpressions) so you can debug complex patterns with named or numbered groups.