siehe delphi-hilfe:
PosEx function
Returns the index value of a substring.
Unit
StrUtils
Category
string handling routines
Delphi syntax:
function PosEx(const SubStr, S: string; Offset: Cardinal = 1): Integer;
C++ syntax:
extern
PACKAGE int __fastcall PosEx(const AnsiString SubStr, const AnsiString S, unsigned Offset = 1);
Description
PosEx returns the index of SubStr in S, beginning the search at Offset. If Offset is 1 (default), PosEx is equivalent to Pos.
PosEx returns 0 if SubStr is not found, if Offset is greater than the length of S, or if Offset is less than 1.