how to get the first 3 characters of each element in a cell to another cell

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Roger
Roger 2014-3-17
评论： Roger 2014-3-18
filename={'CD2.2008052716-17hZCFPF.GY.txt', 'GOM.2008052716-17hZCFPF.GY.txt','GYA.2008052716-17hZCFPF.GY.txt'}
then I want to get a new cell
it would be like {'CD2',"GOM','GYA'};
how to make it

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采纳的回答

Jan
Jan 2014-3-17
filename = {'CD2.2008052716-17hZCFPF.GY.txt', ...
'GOM.2008052716-17hZCFPF.GY.txt', ...
'GYA.2008052716-17hZCFPF.GY.txt'};
P = strtok(filename, '.')

更多回答（2 个）

Azzi Abdelmalek
Azzi Abdelmalek 2014-3-17
out=cellfun(@(x) x{1},regexp(filename,'[^\.]+(?=\.(.+))','match'),'un',0)
Andrei Bobrov
Andrei Bobrov 2014-3-17
In the general case:
filename = {'CZXDD2.2008052716-17hZCFPF.GY.txt', 'GOM.2008052716-17hZCFPF.GY.txt','GY3SAA9.2008052716-17hZCFPF.GY.txt'};
out = regexp(filename,'^\w*(?=\.)','match');
out = [out{:}];

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