Regex Tester
Test and validate regular expressions
Click a test case below to load a pattern and sample text
hello/hello/i\d{3}-\d{3}-\d{4}How to Test Regular Expressions
- Enter Regex Pattern: Type your regular expression pattern in the first input field. The tool will validate the syntax in real-time.
- Add Test Text: Enter or paste the text you want to test against your regex pattern in the second input field.
- Review Matches: View highlighted matches, match positions, and captured groups. Use the detailed results to refine your regex pattern.
Frequently Asked Questions
What is a regular expression (regex)?
A regular expression is a sequence of characters that defines a search pattern. It's used for finding and manipulating text based on patterns, making it powerful for text processing, validation, and data extraction across programming languages.
What regex flavor does this tester use?
This tester uses JavaScript's regex engine, which supports most standard regex features. It includes support for groups, quantifiers, character classes, lookaheads, and other common regex constructs used in web development.
How do I test my regex patterns?
Simply enter your regex pattern in the first field and test text in the second field. The tool will highlight matches in real-time and show detailed information about each match, including position and captured groups.