Urgent: Doubt in coding a logic

Question

Hi Experts,
I have a doubt in coding a logic . The bussiness requirement is that i have to capture a string of alphabets and check for particular alphabet in particular position and then process the rest of the logic.
the logic is given below , can anyone suggest me coding for this logic .Its very urgent . points will be rewarded.
Logic:
If 1st letter is D then
    If 3rd letter of DPVERSION is:
        A --> Asia (like DPA0202)
        C --> EMEA (like DPC0111)
        L --> Latin America LA (like DPL0502)
        N --> North America NA (like DPN0408)
        W --> EMEA (like DPW0207)
        D then
            if 4th letter is:
                A --> Asia (no example yet)
                C --> EMEA (no example yet)
                L --> Latin America LA (no example yet)
                N --> North America NA (like DPDN01TH)
                W --> EMEA (like DPDW09TH)
            End If
      End If
Else if 1st letter is X then:
     If 2nd letter of DPVERSION is:
        A --> Asia (no example yet)
        C --> EMEA (XEHC_RTF)
        L --> Latin America LA (no example yet)
        N --> North America NA (XNFAB_RTF)
        W --> EMEA (no example yet)
    End If
End If
Thanks in advance
Kumaran

Answer 1

Hi, I think you can adopt offset logic.
assign character value to a variable  like string+2(3) = char
then use case statement
case char
when 'A'
write ASIA
when--
End case.
Like this u can approach . 
Hope this helps
Regards
Pavan