Level 5: Advanced · Exercise 49 of 52 · Pro

Password rules with lookaheads

A regex exercise from Regexdrill. Solve it with a pattern box with live highlighting in your browser, checked against hidden test strings, and it is checked the moment you submit.

The task

The whole line must match. A valid password has at least 8 characters, no spaces, and at least one lowercase letter, one uppercase letter and one digit, in any order.

What this exercise teaches

(?=.*[a-z])(?=.*[A-Z])(?=.*\d)\S{8,} checks each rule from the start of the line, then requires 8 or more non-space characters.

A hint if you get stuck

Stack one lookahead per rule at the start, like (?=.*[a-z]), then match the allowed characters.