Question

Hi I need to use php’s pregmatch to check a string is valid. In order to be valid the string needs to have at least one uppercase character, at least one lowercase character, and then at least one symbol or number

thanks

Answer 1

If the match has to be in the order you’ve described, you could use

$result = preg_match('/[A-Z]+[a-z]+[\d!$%^&]+/', $string);

If the characters can be in any order I’m not so sure, without doing three separate checks like so:

$result = (preg_match('/[A-Z]+/', $string) && preg_match('/[a-z]+/', $string) && preg_match('/[\d!$%^&]+/', $string));

As people have pointed out below, you can do this all in one regular expression with lookaheads.