Regex Library Generator
Browse and copy prebuilt regex patterns for common use cases
About Regex Library
Regular expressions (Regex) are powerful tools for pattern matching and text validation, but they can be difficult to write from scratch. Our Regex Library provides a curated collection of tested, reliable regex patterns for common development tasks.
Common Use Cases
- Form Validation: Emails, phone numbers, passwords, postal codes
- Data Extraction: URLs, hashtags, dates, prices
- String Manipulation: Removing whitespace, replacing characters
- Security: Input sanitization, SQL injection prevention
Simply search for what you need, copy the pattern, and use it in your JavaScript, Python, PHP, or other regex-supported languages.
Frequently Asked Questions
Most patterns use standard PCRE (Perl Compatible Regular Expressions) syntax, which works in JavaScript, PHP, Python, Java, and .NET. However, some advanced features might vary slightly between engines.
The patterns provided are the raw regex strings. You'll need to add flags yourself
depending on your language. For example, in JavaScript:
new RegExp(pattern, 'gi') or /pattern/gi.
We recommend testing any regex pattern with your specific data before using it in production. Tools like our Regex Tester can help verify matches against your test cases.
It checks for a combination of uppercase letters, lowercase letters, numbers, and special characters to ensure a password meets complexity requirements.
Basic patterns typically handle ASCII. For full Unicode support (e.g., emojis,
international characters), you may need to add the u flag and use
unicode property escapes if your environment supports them.