/**
* Tells how many substrings with a specified text there are in a string.
*
* The search is case-sensitive.
*
* @param string $substring The searched substring.
* @param int $startPos **OPTIONAL. Default is** `0`. The starting position for the search.
*
* @return int The number of such substrings in the string.
*/
public function numSubstrings($substring, $startPos = 0)
{
return CUString::numSubstrings($this, $substring, $startPos);
}