Question

I’m again struggling with some regex syntax for a password validation.

The rules for a password are:

1. must contain at least number
2. must contain at least one special character of the set . : , ; - $ % _ = ! ?
3. must NOT contain other special characters than the set above in rule 2
4. may contain one or more regular word characters lowercase or uppercase

I’ve come so far:

var regex = /.*(?=.*[\.:,;\-\$%=\!\?])(?=.*\d).*/;

But this does only meet the rules 1 and 2 and allows any other special characters.

Can anyone help?

Answer 1

must contain at least number

/\d/

must contain at least one special character of the set . : , ; – $ % _ = ! ?

/[.:,;\-$%_=!?]/

must NOT contain other special characters than the set above in rule 2
may contain one or more regular word characters lowercase or uppercase

/^[a-z0-9.:,;\-$%_=!?]+$/

Putting it all together

/^(?=\D*\d)(?=[a-z0-9]*[^a-z0-9])[a-z0-9.:,;\-$%_=!?]+$/i

And if you want to enforce a minimal length you can use {6,} or something similar,

/^(?=\D*\d)(?=[a-z0-9]*[^a-z0-9])[a-z0-9.:,;\-$%_=!?]{6,}$/i