Regex Tester

What is a Regular Expression?

A regular expression (regex) is a sequence of characters that defines a search pattern. Regex is used to find, match, and manipulate text in programming, data validation, log analysis, and search-and-replace operations.

How to Use This Tool

1. Enter your regex pattern in the pattern field.
2. Set flags (g for global, i for case-insensitive, m for multiline).
3. Paste your test string below.
4. Matches are highlighted in real time.

Common Regex Patterns

Email validation: [a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}

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

Phone number: \+?[\d\s\-()]{7,15}

Tips

• Use anchors (^ and $) to match start and end of string.
• Use \d for digits, \w for word characters, \s for whitespace.
• Quantifiers: * (0 or more), + (1 or more), ? (0 or 1), {n,m} (between n and m).