Question

I am currently writing a small script that checks the contents of each string.

I was wondering what the REGEX would be to make sure that a string has a letter (upper or lower), a digit, and a special character?

Here is what I know so far (whcih isn’t much):

if(preg_match('/^[a-zA-Z0-9]+$/i', $string)):

Help would be great!

Thank You!

Answer 1

The easiest (and probably best) way is to do three separate checks with preg_match:

$containsLetter  = preg_match('/[a-zA-Z]/',    $string);
$containsDigit   = preg_match('/\d/',          $string);
$containsSpecial = preg_match('/[^a-zA-Z\d]/', $string);

// $containsAll = $containsLetter && $containsDigit && $containsSpecial