How to match strings

Hi,
I have three strings: WER4580U, NID8959T, FTK4797K in one column of my microsoft access database and three numbers:IO-23,DD-98,IL-33 in another column respectively.
My program is that if i key in WER4580U in my front panel, it will go and match the strings and give out IO-23. 
I can get upto this stage.
What i want to do is that
If the no. of matches of the string is greater than 4, it will match and give out the results.
If the no. of matches of the string is less than 4, it will go to another strings and match again until the no. of matches become less than 4 and give out the results.
for eg. the strings save inside my database is WFR4B8?U, and the one i key in is WER4580U, it will still match and give out the result IO-23.
for eg. the strings save inside my database are WFR4B8?U and NLB895?T and , and the one i key in is NID8959T, it will go and match with WFR4B8?U first and no. of matches is less than 4 so go and match again with NLB895?T and now no. of matches is greater than 4, so give out the result of DD-98.
I am quite new to labview so i don't know how to write such a simple program.
If someone can help that will be great .
Thanks for your help .

But my matching part is something like this.. my program only works when all the characters are the same..
I don't know how to add no. of matches part in it and give out the result if the no. of matches is greater than 4.
Attachments:
matching.vi ‏14 KB

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