Fix the regex

Build or choose the right regex to match valid strings and reject invalid ones.

About Regex Rescue

Regex Rescue is a short daily puzzle: match the strings that should match, reject the rest. Every day everyone gets the same challenge so you can compare results. Beginner uses multiple choice; Intermediate and Advanced let you type your own pattern.

Why it helps

Build reflexes for anchors, character classes, and quantifiers.
Recognize the wrong answers people commonly write.
Use the related Regex Generator & Tester for real work.

Runs locally in your browser. Progress is stored only in this browser.