RegEx Library & Tester

Comprehensive regular expression tester with extensive built-in pattern library covering common validation patterns for email, URL, phone numbers, and more with live testing and educational support. This development tool provides pattern templates, live regex testing, match highlighting, group extraction, and detailed explanations with comprehensive documentation. Perfect for developers, data validation, form validation, text processing, and learning regular expression patterns through practical application and interactive testing with real-world examples.

Pattern Templates Live Testing Match Highlighting Group Extraction
Quick Examples
EMAIL: ^[\w.-]+@[\w.-]+\.\w+$
URL: https?://[\w.-]+
PHONE: \d{3}-\d{3}-\d{4}

RegEx Patterns

/ / g
Use forward slashes to delimit your pattern. Flags are shown on the right.
Flags

Quick Actions

Test String

Characters: 0 | Lines: 0

Results

0 matches

Run a test to see results here

RegEx Quick Reference

Character Classes
  • . - Any character
  • \d - Digit (0-9)
  • \w - Word character
  • \s - Whitespace
  • [abc] - Any of a, b, or c
  • [^abc] - Not a, b, or c
Quantifiers
  • * - 0 or more
  • + - 1 or more
  • ? - 0 or 1
  • {3} - Exactly 3
  • {3,} - 3 or more
  • {3,5} - 3 to 5
Anchors
  • ^ - Start of string
  • $ - End of string
  • \b - Word boundary
  • \B - Not word boundary
Groups
  • (abc) - Capture group
  • (?:abc) - Non-capture group
  • (?=abc) - Positive lookahead
  • (?!abc) - Negative lookahead

Help & Related Tools

Everything you need to know

FAQ Frequently Asked Questions

What common regex patterns are included in the library?
The library typically includes patterns for email validation, phone numbers, URLs, postal codes, credit card numbers, dates, IP addresses, and other common data validation needs. These serve as starting points for customization.
Can I test regex patterns with my own sample data?
Yes, you can input your own test strings to see how regex patterns match your specific data. This helps validate patterns before implementing them in your applications or data processing workflows.
Does the tool explain how regex patterns work?
Many tools provide pattern explanations, breaking down regex components and showing what each part matches. This educational feature helps you understand and modify existing patterns or create new ones.
Can I save custom regex patterns for future use?
Most tools allow saving frequently used patterns, creating personal regex libraries, and organizing patterns by category or project. This saves time when working on similar validation or parsing tasks.
Is this helpful for learning regular expressions?
Excellent for learning! The combination of pattern library, real-time testing, and explanations provides hands-on experience with regex concepts, making it easier to understand this powerful text processing tool.

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