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Regex Tester & AI Rule Explainer

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Build, test, and debug regular expressions with live match highlighting and AI explanations.

4.9 rating
270K users
Instant

Interactive Regular Expression workbench featuring real-time regex highlighting, match group inspection, cheat sheets, and AI explanation of complex regex patterns.

How to use

  1. 1 Enter your Regular Expression pattern and select flags (g, i, m, s).
  2. 2 Type or paste test string content in the sample input field.
  3. 3 Watch matched tokens and capture groups highlight live.
  4. 4 Click Explain Regex to read human breakdown of what the pattern matches.

Features

  • Real-time token syntax highlighting.
  • Detailed list of capture groups and index offsets.
  • Common regex pattern presets (Email, URL, IP Address, Phone, Date).

Benefits

  • Avoid regex errors in production code.
  • Understand complex regular expression syntax effortlessly.

Frequently asked questions

Which regex dialect does it use?

Uses standard JavaScript ES2024 Regex engine supporting lookbehinds and named capture groups.

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