Common Regex Patterns Library
Searchable library of battle-tested regex patterns for email, URL, IP, phone, dates, and more.
What is Regex Patterns?
A reference library of common regex patterns that have been tested and optimized. Each entry shows the pattern, flags, a description of what it matches, and test examples.
How it works
We maintain a local catalog of curated patterns organized by category (validation, extraction, networking, text). Search filters by name or category.
- Enter your input. Type or paste your input into the field above — the tool responds instantly.
- Review the result. Output updates live as you type. Everything runs entirely in your browser.
- Copy or download. Use the Copy button to grab the result, or Download to save it as a file.
Examples
Battle-tested starting points
Browse common patterns — email, URL, phone, IP address, date — with explanations and test inputs.
Common mistakes
Copy-paste without validation
Library patterns are starting points, not guarantees — validate against your real inputs before using in production.
Frequently asked questions
Are these patterns reliable for production?
They cover the common cases well, but always test against your specific data. Email regexes, for example, cannot be 100% RFC-compliant while staying readable.