Developer Tools

Regex Library

Use the Regex Library online. No account needed.

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Common patterns (10)
  • Email
    /^\S+@\S+\.\S+$/
    Simple email address
  • URL (http/https)
    /^(https?):\/\/\S+$/
    Starts with http:// or https://
  • IPv4
    /^(25[0-5]|2[0-4]\d|1?\d?\d)(\.(25[0-5]|2[0-4]\d|1?\d?\d)){3}$/
  • Hex color
    /^#(?:[0-9a-fA-F]{3}){1,2}$/
  • UUID v4
    /^[0-9a-f]{8}-[0-9a-f]{4}-4[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$/i
  • ISO date (YYYY-MM-DD)
    /^\d{4}-\d{2}-\d{2}$/
  • Digits only
    /^\d+$/
  • Non-digits
    /^\D+$/
  • Whitespace
    /\s+/
    One or more whitespace chars
  • Trim edges
    /^\s+|\s+$/
    Leading or trailing whitespace
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What is Regex Library?

Regex Library is a free online utility in the "Developer Tools" category. It helps you work faster with a clean, simple interface.

How to use

  1. Open the tool.
  2. Follow on-screen inputs or paste your content.
  3. Copy or download the result.

FAQs

  • Is Regex Library free? Yes, free to use in your browser.
  • Do I need to sign up? No signup required.
  • Is my data stored? Inputs are processed in-browser when possible.