Free toolsRegex tester
Regex tester
Validate patterns for course forms, code samples, and API tutorials—no server round trip.
Pattern
JavaScript
RegExp—handy for validating lesson IDs, URLs in docs, or API examples.Test string
Matches (2)
With the global flag, execution stops after 500 matches to keep the page responsive.
- @9 team@example.com
- @29 support@school.edu
Frequently asked questions
- Which regex flavor?
- JavaScript regular expressions as in your browser—useful for front-end validation patterns and docs examples.
- Why cap matches?
- Very chatty patterns on long inputs could freeze the tab; we stop after 500 global matches.
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