Regex supporting alphaNumeric and punctuation characters only

Question

I'm working on an app that needs a password validation.

I should check if the password string contains only alphanumerical and puntionations, and at least it should be a combination of letters and numbers to pass.

Can someone help me and share a regex that will work for this validation?

Thanks

Answer 1

An idea with use of lookaheads.

^(?=\D*\d)(?=.*?[a-zA-Z])\p{Graph}+$

Or as a Java string:

"^(?=\\D*\\d)(?=.*?[a-zA-Z])\\p{Graph}+$"

• (?=\D*\d) the first lookahead checks for a digit
• (?=.*?[a-zA-Z]) the second for at least one alpha

From ^ start to $ end \p{Graph} + one or more.

• \p{Graph} consists of [\p{Alnum}\p{Punct}]
• \p{Alnum} alphanumeric characters [A-Za-z0-9]
• \p{Punct} one of !"#$%&'()*+,-./:;<=>?@[]^_`{|}~

See demo at regexplanet (Java)