MATLAB: Exact string match to confirm the string existence in the file

MATLABstring searchstrings

Hi all,
Could you find the exact string match in the input file?
I am unable get exact match of the sting in the read file, i tried this using strfind command, but could not get what i want.
My case is as follows,
Input file has data, out of it I need to find specific exact string in the file, suppose my input file name is input_data.txt and the data 
>> txt = fileread('input_data.txt')
>> txt =  
    'var_abc = 12;
     var_abcd = 20;
     var_xyz = 30;
     var_xy = 152;
     var_abcxyz = 142;'
In this data i need to confirm specific string is present or not in the file.
Suppose i want to search the string var_ab in the file it's giving me
strfind(t, 'var_ab')
ans =
     1    16    62
but it is finding strings within other strings, here I need to search only exact specific string var_ab
If the specificr string is present in the file, it should return true/value/string else an empty/false output
i.e
strfind(t, 'var_ab')
ans =
     []
-Thanks

Best Answer

>> txt = fileread('input_data.txt');
>> spl = regexp(txt,'\w+','match');
>> any(strcmp('var_ab',spl(1:2:end)))
ans = 0
>> any(strcmp('var_abc',spl(1:2:end)))
ans = 1
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