Regex tester
FavoriteRegex tester shows live matches on your sample text. Enter a pattern and flags, then see highlights and a match list. Free, private, no sign-up.
Matches: 0
How it works
- 1
Enter your data
Text, a link, or settings — right on this page.
- 2
Instant result
Everything runs on your device. We do not get a copy.
- 3
Copy or save
Use it right away.
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Why people use Toolsy
Fast
You get the result in a second. No waiting in a line.
Private
Browser tools stay on your device. Uploaded files are processed and discarded with the response.
No sign-up
Open the page and start. An account is only for paid plans.
Other tools
Debug patterns with a regex tester before you ship
A regex tester shows matches on real sample text so you catch mistakes before the pattern goes into code.
Enter the expression, set flags, and paste your text. Highlights and a match list update as you edit.
Use this regex tester for emails, logs, CSV cleanup, and learning. Nothing leaves your browser.
Good for
- Email and phone patterns
- Log parsing
- Find and replace prep
- Learning regex
Tips
- Start with a small sample
- Turn on g to see every match
- Fix syntax errors first
- Copy matches from the list
Common questions
What is a regex tester?
A regex tester lets you try a regular expression on sample text and see matches before you use the pattern in code.
How do I use this regex tester?
Enter the pattern, optional flags, and your text. Matches highlight in place and list below for copy.
Which flags does this regex tester support?
Common JavaScript flags such as g (all matches) and i (ignore case). Invalid patterns show an error so you can fix syntax.
Is this regex tester free?
Yes. Test patterns as often as you need with no account.
Does the regex tester upload my text?
No. Matching runs in your browser. We do not see or store your sample.