How to find an occurrence in a string of more than 4 letters?

Question

PHP

Code

$str = "asas232%";
preg_match('/^[^a-z]*(?=[a-z])/i', $str);

we find if there are letters in the string.
I need to find if there are more than 4 consecutive letters in a string.
I tried through the length of the incoming substring, but it did not work

$s = strstr($str, '/^[^a-z]*(?=[a-z])/i');
if ($s>3){echo('Great!');}

Answer 1

Well, add the number of matches to the regular season.
[a-z]{5,}