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Test regex patterns online with instant visual matching, capture groups, and multi-language code generation. Debug and validate regular expressions for JavaScript, Python, Java, PHP, and more. Free regex testing tool with find & replace, pattern explanations, and live preview.
g=global, i=ignoreCase, m=multiline, s=dotAll, u=unicode, y=sticky
Enter your regular expression pattern in the regex input field
Add your test string to validate the pattern against
Select regex flags (g for global, i for case-insensitive, m for multiline)
View instant visual matches highlighted in your test text
Test capture groups and view extracted values
Generate code for your preferred programming language
Email Validation: Create and test email validation regex patterns
Form Input Validation: Validate phone numbers, postal codes, usernames
Text Parsing: Extract data from logs, CSV files, or structured text
URL Matching: Validate and extract URLs from text
Data Cleaning: Find and replace patterns in large text datasets
Code Review: Verify regex patterns before code deployment
Learning Regex: Practice and understand regular expression syntax
Regex flags modify how patterns behave. Our tester supports all standard flags:
Use these common regular expression patterns as starting points for your own regex:
^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$https?:\/\/(www\.)?[-a-zA-Z0-9@:%._\+~#=]{1,256}\.[a-zA-Z0-9()]{1,6}\b^(\+1[-.\s]?)?\(?\d{3}\)?[-.\s]?\d{3}[-.\s]?\d{4}$^\d{4}-(0[1-9]|1[0-2])-(0[1-9]|[12]\d|3[01])$Our regex tester supports pattern testing for multiple programming languages. Test regex for JavaScript, Python, Java, PHP, and many more. The tool helps you verify patterns work correctly before implementing them in your code.
Test regex patterns with the test() and match() methods. JavaScript regex testing supports all modern ES6+ features. Use our tool to test regex JavaScript online, verify case-insensitive matching, and validate patterns before deployment. TypeScript regex testing follows the same patterns with type safety.
Test regex Python patterns using the re module. Python regex match, search, findall, and sub operations are all supported. Our tool helps you test regex match Python patterns and verify they work with your data before implementation.
Test regex Java patterns with Pattern and Matcher classes. Java regex testing ensures your patterns work correctly with java.util.regex. Kotlin regex follows similar patterns with enhanced syntax and null safety.
Test regex PHP patterns with preg_match, preg_match_all, and preg_replace functions. Our tool helps validate PCRE (Perl Compatible Regular Expressions) patterns used in PHP.
Test regex for Go (regexp package), Rust (regex crate), Ruby (Regexp class), Perl (native regex), C# (Regex class), Swift (NSRegularExpression), Dart (RegExp class), and more. Our universal regex tester works across all these languages.
When testing regex, always use anchors (^ and $) to ensure complete string matching. Test your patterns with edge cases including empty strings, special characters, and unicode. Use lazy quantifiers (*?, +?) instead of greedy ones to avoid performance issues with large text.