Regular Expression Tester

Test and validate regular expressions with real-time pattern matching, highlighting, and common regex examples

Regular Expression Pattern

Regex Pattern

Test String

Common Patterns

Email addresses

/\b[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Z|a-z]{2,}\b/

Phone numbers (XXX-XXX-XXXX)

/\b\d{3}-\d{3}-\d{4}\b/

URLs

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

IP addresses

/\b\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\b/

All uppercase words

/\b[A-Z]{2,}\b/

All words

/\b\w+\b/

Numbers

/\d+/

Each line (multiline)

/^.+$/

Results

Matches Found: 2

Text with Highlighted Matches

Hello World! This is a test string. hello there!

Match Details

Match 1 Position: 0-5

"Hello"

Match 2 Position: 36-41

"hello"

Regex Tips & Guide

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Basic Syntax

Use /pattern/flags format. Common flags: i (case-insensitive), g (global), m (multiline)

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Common Patterns

\d = digits, \w = word chars, \s = whitespace, . = any char, + = one or more, * = zero or more

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Testing Tips

Start simple and build complexity. Use the common patterns as starting points for your own expressions.

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Performance

Avoid overly complex patterns. Use specific patterns instead of broad ones for better performance.