compute the repetition of a string in a text file

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Dear all, how i compute the repetition of a special string in a file txt for example the A.txt file have the following lines;
AAA 1
1
2
AAA 2
BBB 1
i would have the number of the AAA repetition which is 2
Thanks

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Cedric
Cedric 2013-3-29
编辑:Cedric 2013-3-29
Your best option for pattern matching is usually regular expressions (regexp).
In this particular situation where the pattern is simple, you can go for a simpler solutions though, as follows:
>> buffer = fileread('A.txt') ;
>> n = numel(strfind(buffer, 'AAA')) ;
Let me know if the pattern is indeed more complicated than a simple string, or if you must differentiate 'AAA' from 'AAAA' for example or avoid matching 'BAAABBB'.

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