Regex Tester

What is a Regex Tester?

A Regex Tester (Regular Expression Tester) is an online tool that helps developers test, debug, and validate regular expression patterns. It provides real-time feedback on pattern matching, highlights matches in your test string, and helps you understand how your regex works.

How to Use the Regex Tester

1. Enter your regular expression pattern in the pattern field
2. Select regex flags (g=global, i=case-insensitive, m=multiline, s=dotAll, u=unicode)
3. Enter or paste your test string in the test area
4. View real-time matches highlighted in the results
5. Check match details including position and captured groups
6. Copy individual matches or all matches at once

Regex Flags Explained

• g (global): Find all matches, not just the first one
• i (case-insensitive): Ignore case when matching
• m (multiline): ^ and $ match start/end of lines
• s (dotAll): . matches newline characters
• u (unicode): Enable full Unicode support

Benefits of Using Our Regex Tester

• ✅ Real-time pattern matching with instant feedback
• ✅ Syntax highlighting for easy visualization
• ✅ Detailed match information including position and groups
• ✅ Common regex patterns for quick testing
• ✅ Support for all JavaScript regex flags
• ✅ Copy matches with one click
• ✅ No installation required - works in your browser
• ✅ Free and unlimited usage

Common Use Cases

Regular expressions are essential for:

• 📧 Email validation and extraction
• 📱 Phone number formatting and validation
• 🔗 URL parsing and validation
• 🔍 Text search and replace operations
• ✅ Input validation in forms
• 📊 Data extraction from logs and files
• 🎨 Pattern matching in code editors