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Regex Tester
Test regular expressions against strings.
Regex Tester
Test regular expressions against strings.
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What is Regex Tester?
Regex Tester tests a regular expression pattern against a test string in real time.
How Does It Work?
The tool uses JavaScript's RegExp constructor along with matchAll() to find all matches.
Common Use Cases
- Pattern development - Develop and debug regex patterns.
- Learning regex - Test patterns from a tutorial.
- Data extraction - Search for email, URL, or date-format patterns.
- Input validation - Test a validation regex before implementing it.
- Log parsing - Extract data from a log file.
Frequently Asked Questions
Q: Why doesn't my regex match?
A: Make sure special characters are escaped correctly and that you've used the "g" flag for all occurrences.
Q: Does it support all JS regex features?
A: Yes, including lookahead, lookbehind, and named groups.
Q: How do I see captured groups?
A: Groups are displayed alongside the main match.