IndexOf

Declaration:

TStringList.IndexOf(const S: string): Integer;

Call IndexOf to obtain the position of the first occurrence of a string that matches S. A string matches S if it is identical to S or, if CaseSensitive is False, if it differs only in case. IndexOf returns the 0-based index of the string. Thus, if S matches the first string in the list, IndexOf returns 0, if S is the second string, IndexOf returns 1, and so on. If the string does not have a match in the string list, IndexOf returns -1.