Regex for password PHP [duplicate]

Answer 1

PHP regular expression for strong password validation

The link above looks like the regex you want. You could try something like the code below:

if(preg_match((?=^.{8,}$)((?=.*\d)|(?=.*\W+))(?![.\n])(?=.*[A-Z])(?=.*[a-z]).*$), $_POST['password']):

echo 'matched';

else:

echo 'not matched';

endif;