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Regex Tester
Test, validate, and debug regular expressions instantly with live matching, highlighting, and detailed results.
100% free, no signup
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Your files are processed in your browser and never uploaded to any server.
How to use this tool
- 1Enter your regular expression pattern.
- 2Add optional regex flags such as g, i, m, or s.
- 3Paste the text you want to test against.
- 4View highlighted matches, match count, and results instantly.
Regex Tester Features
Supports Standard Regex Flags
Includes support for global (g), case-insensitive (i), multiline (m), dotAll (s), and more.
Match Count & Details
Get detailed match information including match count, positions, and captured groups.
Instant Regex Validation
Detect invalid regex patterns instantly with clear error messages.
Privacy-Focused
All regex testing happens locally in your browser, keeping your patterns and data private.
Free & No Signup
Test regular expressions for free without creating an account or registering.
What Is a Regex Tester?
A Regex Tester is a tool that allows developers to test and debug regular expressions against sample text. It highlights matches, shows detailed match information, and helps validate that your regex pattern works as expected.
Our Regex Tester supports JavaScript (ECMAScript) regular expression syntax, making it an essential tool for frontend and backend developers.
How to Test Regular Expressions Online
To test a regular expression, enter your pattern in the regex field, add any flags you need (like g, i, or m), and paste your test text in the text field.
Matches will be highlighted instantly, and you'll see match count and detailed match information.
Regex Tester for JavaScript Developers
JavaScript developers use regular expressions for form validation, string parsing, text replacement, and data extraction. Our Regex Tester helps you quickly validate and debug patterns before integrating them into your code.
It supports the same syntax and flags as JavaScript's RegExp object, making it a reliable tool for development.
Common Use Cases for Regular Expressions
Regular expressions are used for validating email addresses, phone numbers, and URLs; extracting data from strings; search and replace operations; and parsing logs or text files.
Our Regex Tester helps you experiment with patterns and confirm they work correctly before deploying them.
Understanding Regex Flags
Flags modify how a regular expression matches text. Common flags include g (global, finds all matches), i (case-insensitive), m (multiline), s (dotAll, makes . match newlines), u (unicode), and y (sticky).
Our tool supports these flags, allowing you to test different matching behaviors in real-time.
Is the Regex Tester Private?
Yes. All regex testing happens locally in your browser. Your patterns and test text are never sent to a server.
This makes our Regex Tester safe for testing sensitive data patterns and confidential text.
Frequently asked questions
What is a regex tester?+
A regex tester is a tool that lets you test and debug regular expressions by checking how patterns match against sample text.
Which regex syntax does this tool support?+
This tool uses standard JavaScript (ECMAScript) regular expression syntax with common JavaScript regex flags.
Can I use this regex tester for JavaScript?+
Yes, it is designed for testing JavaScript-compatible regular expressions used in frontend and backend development.
Is my test data stored anywhere?+
No, regex matching happens locally in your browser and your patterns or text are never sent to a server.
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