strng is a data string (enclosed in quotes) or variable with a value that is a string. Mandatory.
substrng is a data string (enclosed in quotes) or variable with a value that is a string. strng is searched for an occurrence of substrng. Mandatory.
occurrence is an integer, or a Control-M/Analyzer variable containing an integer value, representing the occurrence of substrng that should be located. Optional. If occurrence is not specified, the position of the first occurrence is returned.
