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devvkit

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Regex Tester

Test regular expressions in real-time with match highlighting and groups.

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Test and debug regular expressions in real time. Write your regex pattern, choose flags, and see matches highlighted instantly in your test string with detailed match information.

>[x]Features
  • -Real-time regex matching with highlighted results
  • -Support for all JavaScript regex flags (g, i, m, s, u, y)
  • -Match details with capture groups and named groups
  • -Test against multi-line strings and multiple test cases
  • -Regex cheat sheet with common patterns
  • -Plain-English explanation of your pattern, token by token
  • -Error messages for invalid regex patterns
>>Use Cases
  • >Debugging regex patterns during web scraping
  • >Testing form validation patterns before deploying
  • >Developing string parsing and transformation logic
  • >Learning and experimenting with regex syntax

Frequently Asked Questions

>What regex engine does it use??
JavaScript's native RegExp engine. It supports all standard regex features including lookahead, lookbehind, and named groups.
>Can I test against multiple strings??
Yes, each line in the test string input is treated as a separate test case.
>Can it explain my pattern??
Yes: hit Explain and the pattern is parsed into plain-English steps: literals, classes, groups, lookarounds, quantifiers, and what each flag does.