Regex Tester
Test regular expressions with live highlighting.
How to use Regex Tester
follow along with the steps below
1Open the tool on this page and add a pattern and some text.
2Adjust the options if you need to. Results update right on the page.
3Copy or download highlighted matches. Nothing is uploaded, so you can repeat as often as you like.
About Regex Tester
Regex Tester is a free online tool from Supreme Pro. Test regular expressions with live highlighting. It runs in your browser, so there is nothing to install and no account to create. Developer utilities are most useful when they are fast and private, so everything runs locally.
Common uses
- Format, encode or inspect data while you code and debug
- Create values such as colors and shadows without leaving the page
- Test small ideas quickly before putting them in a project
Tips for best results
- Never paste secrets or production credentials into any online tool
- Validate the output in your own environment before you ship it
- Use the copy button to avoid typing mistakes
Features
- Lets you test regular expressions against sample text
- Free to use, no account or sign-up
- Private — runs entirely in your browser
- Works on phones, tablets and computers
Practical tips
Build a pattern in small steps: match one piece, confirm it highlights what you expect, then add the next part. Test with examples that should match and examples that should not, including empty input and awkward edge cases. Remember that special characters such as the dot and brackets need escaping if you mean them literally.
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Quick answers about using Regex Tester.
What is the Regex Tester?
The Regex Tester is a free online tool from Supreme Pro. Test regular expressions with live highlighting. You can use it to test regular expressions against sample text.
How do I use the Regex Tester?
Open this page, add a pattern and some text in the tool above, adjust any options you want and read or download highlighted matches. Everything happens on the same page, so there is nothing to install.
Is the Regex Tester free?
Yes. The Regex Tester is free to use and does not need an account or sign-up.
Is my data safe when I use the Regex Tester?
Yes. The tool runs in your browser, so anything you add — such as a pattern and some text — is processed on your own device rather than being sent to our servers.
Does the Regex Tester work on mobile phones?
Yes. The page is responsive and works in modern browsers on phones, tablets and computers.
Can I use the Regex Tester offline?
Once you have opened this page, your browser can often reload it without a connection because Supreme Pro saves its core files for offline use. Open it once while online first.
How accurate are the results?
Results are calculated from the values you enter using standard methods. For important financial, health or legal decisions, double-check the figures with a qualified professional.
Why does my pattern match too much?
Quantifiers like .* are greedy and take as much text as they can. Try the lazy form .*? or a more specific character class.
Do flags change the result?
Yes. Flags such as global and case-insensitive change how many matches you get and how letters are compared.
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