How do you search a file for a matching string?

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I have a huge contacts list in a excel file which consists of following fields
FirstName LastName UserID EmailAddress.
I have FirstName and LastName in MATLAB as a variable.
How do I extract the user ID and EmailAddress for a corresponding FirstName and LastName?
Note:There are some 50,000 contacts in Excel file.

Accepted Answer

Azzi Abdelmalek
Azzi Abdelmalek on 2 Feb 2013
idx=find(strcmp(v(:,1),s1) & strcmp(v(:,2),s2)

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