Regex cheat sheet
Search a library of ready-to-use regex patterns, read the syntax reference, and test any expression against your own text with live match highlighting. Nothing is uploaded.
Live tester
Regular expression
/
/
g
Flags
Test string
Matches
Pattern library
No patterns match your search.
Syntax reference
Everything runs in your browser. No upload, no sign-up.
How it works
STEP 1
Search the pattern library
Type what you need — “email”, “IP”, “date” — and the library filters live. Each pattern shows the regex and a one-line description.
STEP 2
Copy or load a pattern
Copy any pattern with one click, or press “Test” to drop it straight into the live tester below.
STEP 3
Test against your own text
Paste a regex and a test string, pick flags, and see every match highlighted in real time — all in your browser.