Passwords

Here’s a regular expression that tests if a string contains at least one uppercase letter, lowercase letter, digit and punctuation/symbol code point, and is at least 8 code points long:

^(?=[\S\s]*?\d)(?=[\S\s]*?\p{Ll})(?=[\S\s]*?\p{Lu})(?=[\S\s]*?[\pP\pS])[\S\s]{8}

Equivalent Pomsky expression:

^
(>> C* [digit])
(>> C* [Ll])
(>> C* [Lu])
(>> C* [P S])
C{8}