Regex Tester
Test regular expressions against sample text with this free regex tester. Enter the pattern and flags in Options, paste sample text as input, then click Test to see match count, match offsets, and capture groups - all in your browser.
Ideal for debugging email/URL patterns without shipping sensitive log lines to a third-party API. Invalid patterns surface the native SyntaxError message inline.
Input
Paste or type your content here…
Output
Your result will appear here
Frequently Asked Questions
Where do I enter the pattern?
Open Options and fill Regex pattern plus flag checkboxes. The main editor holds sample text.
Does it run on a server?
No - matching uses the browser RegExp engine only.