Regex Pattern Library
Browse, search, and test 35+ ready-to-use regular expression patterns
Pattern Library 0
Test Panel
Usage Examples
Email Validation
Test email address patterns against sample data to validate email formats.
IP Address Matching
Use IPv4 validation regex to identify valid and invalid IP addresses.
Password Strength
Check password strength requirements with regex patterns for uppercase, lowercase, digits and special characters.
Features
35+ Ready-to-Use Patterns
Curated collection of commonly used regex patterns organized by category for quick access
Search & Filter
Quickly find patterns by keyword search or filter by category like Email, URL, IP, Phone and more
Built-in Test Panel
Test any pattern against your text with real-time match highlighting and match count
Privacy First
All regex testing happens locally in your browser, no data is sent to any server
How to Use?
Browse or Search
Browse patterns by category or use the search bar to find a specific regex pattern.
Copy or Test
Click the copy button to copy the regex, or click "Test" to load it into the test panel.
Test with Your Data
Paste your text in the test area to see matches highlighted in real-time with match count.
Frequently Asked Questions
What Is the Regex Pattern Library?
A searchable catalog of 35+ ready-to-use regular expressions organized by category -- email, URL, IP, phone, date, password, HTML, numbers, and more. Each entry shows the pattern, a description, and sample matches so you know exactly what it catches.
Built-In Test Panel
Pick a pattern (or write your own), paste some text, and see matches highlighted in real time. Toggle global, case-insensitive, or multiline flags without leaving the page.
Practical Use Cases
Form validation in web apps, log parsing scripts, data cleanup pipelines, or just figuring out the right regex before you hardcode it. Way faster than starting from scratch.
Tips
Use the search bar to filter by keyword (e.g., "email" or "ipv4"). Copy a pattern with one click and paste it into your code. Test edge cases in the panel before committing.
Privacy
Everything runs client-side in your browser. No text or patterns are sent to any server.