Regex Builder & Tester

Build and test regular expressions with ready-made templates for Email, URL, and more.

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Enter a pattern to see matches

How to use the Regex Builder

  1. Choose a quick template (e.g., Email, URL) or type your pattern.
  2. Use the flag buttons (g, i, m) to adjust behavior.
  3. Paste test text to validate instantly.
  4. See results and capture groups in real-time.

Features

  • Quick Pattern Library (Email, URL, etc)
  • Real-time testing
  • Flag support (Global, Case Insensitive, Multiline)
  • Group visualization

Frequently Asked Questions

What is Regex?

Regular Expressions are patterns for finding or replacing text. Useful for form validation and data extraction.

Are patterns validated?

Yes, quick templates follow official standards (RFC for emails, standard algorithms for common formats).

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Regex Builder & Tester - dailyTools