function PosEx2(const S, SubStr: string; Offset: integer = 1): integer;
begin
asm
        PUSH EDI
        PUSH ESI
        PUSH EBX
        PUSH EAX
        OR EAX,EAX
        JE @@2
        OR EDX,EDX
        JE @@2
        DEC ECX
        JS @@2
        MOV EBX,[EAX-4]
        SUB EBX,ECX
        JLE @@2
        SUB EBX,[EDX-4]
        JL @@2
        INC EBX
        ADD EAX,ECX
        MOV ECX,EBX
        MOV EBX,[EDX-4]
        DEC EBX
        MOV EDI,EAX

@@1:    MOV ESI,EDX
        LODSB
        REPNE SCASB
        JNE @@2
        MOV EAX,ECX
        PUSH EDI
        MOV ECX,EBX
        REPE CMPSB
        POP EDI
        MOV ECX,EAX
        JNE @@1
        LEA EAX,[EDI-1]
        POP EDX
        SUB EAX,EDX
        INC EAX
        JMP @@3

@@2:    POP EAX
        XOR EAX,EAX
        
@@3:    POP EBX
        POP ESI
        POP EDI
end;
end;