RegexGen - Generate & Explain Regular Expressions (JavaScript, Python, PHP)

Regex Generator & Explainer

Create, test, and understand regular expressions in real-time

Results
Your regex will appear here...
Matches will appear here...
Regex explanation will appear here...

Key Features

Smart Regex Generation

Describe what you need to match in plain English and get a working regex pattern.

Detailed Explanations

Understand how each part of your regex works with clear explanations.

Multi-Language Support

Works with JavaScript, Python, PHP and other regex flavors.

How to Use This Regex Tool

1

Generate a Regex Pattern

  • Select the "Generator" tab
  • Describe what you want to match (e.g., "email addresses")
  • Optionally provide sample text
  • Click "Generate Regex"
2

Test & Refine Your Regex

  • Switch to the "Tester" tab
  • Enter or modify your regex pattern
  • Add test strings to validate matches
  • Adjust flags (g, i, m) as needed
3

Understand & Use Your Regex

  • Read the explanation to learn how it works
  • Copy the pattern to your code
  • Select the appropriate language syntax
  • Share your regex with others

Common Regex Patterns

Description Pattern Try It
Email Address ^\S+@\S+\.\S+$
URL https?:\/\/(www\.)?[-a-zA-Z0-9@:%._\+~#=]{1,256}\.[a-zA-Z0-9()]{1,6}\b([-a-zA-Z0-9()@:%_\+.~#?&//=]*)
Phone Number (US) (\+?\d{1,2}\s?)?\(?\d{3}\)?[\s.-]?\d{3}[\s.-]?\d{4}