Counting the number of specific characters inside string

Question

I\'m sorry, I just found a new problem due to my question about: Get The Number of Sepecific String Inside String.

I have been trying hard, how to find the number of

Answer 1

$k_count = substr_count($string, 'K') - substr_count($string, 'K-');
$k1_count = substr_count($string, 'K-1');

or

Counting K not followed by dash as follows:

$k_count = preg_match_all('/*K(?!-)/*', $string, $out);