Returns the index value of a substring.
function PosEx(const SubStr: string; const S: string; Offset: Integer = 1): Integer; overload;
int PosEx(const AnsiString SubStr, const AnsiString S, int Offset = 1);
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.
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