strng is the data string (enclosed in quotes) or variable with a value that is a string, from which an occurrences of a substring is to be removed. Mandatory.
substrng is the data string (enclosed in quotes) or variable with a value that is a substring (that represents a word). One or more occurrences of this substring will be removed from strng. Mandatory.
firstOccur is an integer that represents an occurrence, or the first of several occurrences, of substrng, that is to be removed from strng. Optional. The default value is 1.
lastOccur, in the case if firstOccur is specified, can be specified as an integer that represents the last occurrence of the substring to be removed from strng. Optional. The default value is the first occurrence.
