Regular Expression Tester

Test, validate, and learn regular expressions with real-time pattern matching

Regular Expression

Pattern:

/ /

Flags:

g Global i Ignore Case m Multiline s Dot All

Test String:

Quick Patterns:

Test Results

Match Status: Ready

Highlighted Matches:

Test results will appear here...

Pattern Explanation

Enter a regex pattern to see its explanation here...

Find & Replace

Replacement String:

Replaced Text:

Common Patterns

Character Classes

\d - Digits (0-9)

\w - Word characters (a-z, A-Z, 0-9, _)

\s - Whitespace characters

. - Any character (except newline)

Quantifiers

* - Zero or more

+ - One or more

? - Zero or one

{n,m} - Between n and m

Anchors

^ - Start of string

$ - End of string

\b - Word boundary

Common Use Cases

Email Validation

Validate email address format

^[^\s@]+@[^\s@]+\.[^\s@]+$

Phone Numbers

Match various phone formats

^\+?[\d\s\-]{10,}$

Password Strength

At least 8 chars with mixed case

^(?=.*[a-z])(?=.*[A-Z])(?=.*\d).{8,}$

URL Extraction

Find URLs in text

https?:\/\/[^\s]+

Features

🎯 Real-time regex pattern testing
🔍 Visual match highlighting
📝 Pattern explanation and breakdown
🔄 Find and replace functionality
📚 Common regex pattern library
🏷️ Capture group visualization

Use Cases

✅ Form validation patterns
🔍 Text parsing and extraction
📧 Email and URL validation
🔐 Password strength checking
📞 Phone number formatting
🎓 Learning regular expressions