Regex Tester

About Regex Tester

Regular expressions (regex) are powerful patterns used for matching, searching, and manipulating text. Our regex tester provides a simple interface to test your patterns, see matches highlighted in real-time, and understand how your regex behaves. Perfect for developers working with text processing, validation, and data extraction.

Common Regex Patterns

• Email: ^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$
• Phone: \d{3}-\d{3}-\d{4} or \(\d{3}\) \d{3}-\d{4}
• URL: https?://[^\s]+
• Date: \d{4}-\d{2}-\d{2} or \d{2}/\d{2}/\d{4}
• IP Address: \b\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\b

Regex Syntax Guide

• . - Matches any character
• \d - Matches digit (0-9)
• \w - Matches word character (a-z, A-Z, 0-9, _)
• \s - Matches whitespace
• * - Matches 0 or more times
• + - Matches 1 or more times
• ? - Matches 0 or 1 time
• {n} - Matches exactly n times
• ^ - Start of string
• $ - End of string

Frequently Asked Questions

Q: What is a regex tester?
A: A regex tester is a tool that allows you to test regular expression patterns against text to see matches and debug patterns.

Q: How do I test regex patterns?
A: Enter your regex pattern, provide test text, select flags, and see matches highlighted in real-time.

Q: What regex flags are available?
A: Common flags include: g (global), i (case-insensitive), m (multiline), s (dotall), and u (unicode).