Regex Tester - Developer Tools
Struggling with regular expressions? Our Regex Tester lets you write, test, and debug regex patterns with live match highlighting and detailed explanations.
What Is
A regex tester is an interactive tool for writing and debugging regular expressions. Regular expressions (regex) are powerful patterns used to match character combinations in strings. They are essential for text processing, data validation, search-and-replace operations, and parsing structured data. Our Regex Tester provides real-time match highlighting, detailed explanations of each pattern element, and support for common flags like global, case-insensitive, and multiline matching. Whether you are validating email addresses, extracting data from log files, or building complex text transformations, a regex tester helps you verify your patterns work correctly before deploying them to production code.
How to Use
- Enter your regular expression pattern
- Type or paste test text in the input area
- Matches are highlighted automatically as you type
- Use flags like global, case-insensitive, and multiline
- Review match details and group captures below
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Frequently Asked Questions
What is a regular expression?
A regular expression (regex) is a pattern that describes a set of strings for searching and matching text.
What flags are supported?
Our tester supports global (g), case-insensitive (i), multiline (m), dotAll (s), unicode (u), and sticky (y) flags.
Why is my regex not matching?
Common issues include escaping special characters, wrong flags, or incorrect quantifiers.
Is my data safe?
Yes, all regex processing happens locally in your browser.