Regex Tester Online
Test, debug, and validate regular expressions with real-time highlighting and explanation. Supports JavaScript, PHP, Python, and Java regex flavors.
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Example: \b[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,}\b for email matching
Enter the text you want to test against your regular expression
Results
Enter a regex pattern and test string above to see results
Match Information:
No matches found yet
Capture Groups:
No capture groups found yet
Regex Explanation
Enter a regex pattern to see an explanation
Common Regex Patterns
What is a Regular Expression?
A regular expression (regex or regexp) is a sequence of characters that defines a search pattern. These patterns are used for string matching, search and replace operations, data validation, and parsing text.
Why Use Our Regex Tester?
- Real-time Testing: See your matches as you type with instant visual feedback
- Multiple Flavors: Test your patterns in JavaScript, PHP (PCRE), Python, and Java
- Detailed Explanations: Understand what each part of your regex does
- Capture Group Visualization: Easily see what your regex is capturing
- Common Patterns: Access frequently used regex patterns for quick testing
- Comprehensive Cheat Sheet: Reference regex syntax without leaving the page
Common Use Cases for Regular Expressions
Regular expressions are powerful tools used in many programming and text processing tasks:
- Form validation (emails, phone numbers, passwords)
- Data extraction from text
- Search and replace operations
- Text parsing and tokenization
- URL routing in web frameworks
- Data cleaning and preprocessing