Last updated on November 23, 2022
Today’s post is about password validation in PHP using Regular Expressions.
Here is the small use full Password Validation function.
function is_valid_password($password) {
return preg_match_all('$S*(?=S{8,})(?=S*[a-z])(?=S*[A-Z])(?=S*[d])(?=S*[W])S*$');
}Password Regular Expression Pattern
The whole combination means at least 8 characters string with at least one digit, one upper case letter, one lower case letter, and one special symbol. This regular expression pattern is very useful to implement a strong and complex password.
$S*(?=S{8,})(?=S*[a-z])(?=S*[A-Z])(?=S*[d])(?=S*[W])S*$Regular Expression Pattern Description
- $ = beginning of the string
- S* = any set of characters(non-whitespace character)
- * = Zero or more s
- (?=S{8,}) = of at least length 8
- (?=S*[a-z]) = containing at least one lowercase letter
- [a-z] = It matches any character from lowercase a through lowercase z.
- (?=S*[A-Z]) = and at least one uppercase letter
- [A-Z] = It matches any character from uppercase A through uppercase Z.
- (?=S*[d]) = and at least one number
- d = a digit (0-9)
- (?=S*[W]) = and at least a special character (non-word characters)
- $ = end of the string
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