No uploads · runs in browser
Regex Tester
Test a regular expression against sample text and see every match highlighted with a count.
Favorite it to find it fast on home
When to use it
Test \d{3}-\d{4}-\d{4} against phone numbers
Check an email pattern before shipping it
Highlight a pattern inside a log excerpt
How to use it
1Step 1Paste your text into Pattern to start
2Step 2Press Test and the result appears below
3Step 3Use the copy button to take the result anywhere
If the result looks off
The result looks cut off
Use the copy button to get the full result.
My input disappeared
It is saved on this device. Clearing browser storage removes it too.
Frequently asked questions
Which flags are supported?
g, i, and m can be toggled. Other flags are not exposed in the UI.
Can it do replacements too?
This tool checks matches. To actually change text, use the Find & Replace tool.