Regex Tester
Free regex tester with live match highlighting, test regular expressions against your text in the browser.
The Regex Tester is a free online regex tester. regex tester with live match highlighting, test regular expressions against your text in the browser. It works instantly in your browser, with no signup and nothing to install.
This free regex tester lets you build and check regular expressions against sample text, with live match highlighting and a match count. Enter a pattern and flags, paste your text, and see exactly what matches.
What is a regular expression?
A regular expression, or regex, is a pattern used to search and match text. Developers use regex for validation, search and replace, and parsing. Testing a pattern against real text is the fastest way to get it right.
How to use the regex tester
- Enter your pattern and any flags such as g, i or m.
- Paste the text to test against.
- Matches are highlighted live, with a total count.
Key features of the Regex Tester
- Free to use with no account, no watermark and no daily limits.
- Runs entirely in your browser, so your data never leaves your device.
- Fast, lightweight and works on desktop, tablet and mobile.
- Simple, clean interface that gives you results in one click.
- No installation, no extensions and no sign-up required.
How the Regex Tester works
The Regex Tester uses your browser to process the input you provide and return a clean result straight away. There is no server round-trip, no queue and no processing limit, so even large inputs are handled quickly. Because everything runs on your device, the tool stays fast and completely private, and it keeps working even when your connection is slow.
Common uses
Developers, marketers, students and business owners reach for a regex tester every day to save time on repetitive tasks. Instead of writing code or installing software, you can open this page and get the job done in seconds. It is handy while building websites, preparing content, testing, debugging or simply cleaning up data on the go.
Is the Regex Tester free and private?
Yes. This regex tester is completely free, with no hidden charges and no limit on how often you use it. Everything is processed locally in your browser using JavaScript, which means nothing you enter is uploaded to a server. That makes it safe to use even with sensitive text or data, and it keeps things fast because there is no waiting for a server to respond.
Tips for the best results
For the most accurate output, paste clean, well-formatted input and check the options before you run it. If something does not look right, adjust your input and try again. The tool is designed to be forgiving, but tidy input always gives the tidiest result, and you can run it as many times as you need at no cost.
Frequently asked questions
Do I need to install anything?
No. The Regex Tester runs in any modern web browser, so there is nothing to download or install. Just open the page and start using it.
Is it really free?
Yes, it is completely free with no account, no trial and no usage limits. You can use it as many times as you like.
Is my data safe?
Yes. All processing happens inside your browser, so your input never leaves your device and is never stored or shared.
Does it work on mobile?
Yes. The tool is fully responsive and works on phones, tablets and computers in any modern browser.
Start using the Regex Tester now
Scroll up, enter your input, and let the Regex Tester do the work. It is a quick, free and private way to get accurate results without any setup, and you can bookmark this page to use the regex tester whenever you need it again.
Frequently asked questions
Which regex flags are supported?
It supports the standard JavaScript flags g, i, m, s, u and y. The global flag is added automatically so all matches are highlighted.
Does it use JavaScript regex syntax?
Yes. Patterns run with the browser JavaScript engine, so the syntax matches what you would use in JavaScript code.
Is my text uploaded?
No. The pattern and text are processed entirely in your browser.