Searches for the occurrence of asubstring within an object string, and returns its position.
search_string The substring to be searched for within object.
If object or search_string are not of type string, they are converted to string using the default formatting rules of PV-WAVE. (These rules are described in Free Format Output in Chapter 8 of the PV-WAVE Programmer's Guide.)
If object is an array, result is an array of the same structure, and each element contains the position of the substring within object.
If search_string is the null string, STRPOS returns the smaller of position or one less than the length of object.