Uppercase string from the cell array

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Gopalakrishnan venkatesan
编辑： Stephen23 2015-8-12
I have a cell array a = {'AA_DFA_DD' ,'DSFA_dfaf' ,'DDDD' , 'DFE1' ,'dfs_DD'}
How can extract only the upper case string from the cell array
my answer should be {'AA_DFA_DD',[],'DDDD','DFE1',[]}
How can i do this?
Thanks a lot

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采纳的回答

Stephen23
Stephen23 2015-8-12
编辑：Stephen23 2015-8-12
regexp(a,'^[^a-z]+$','match')
  2 个评论
Gopalakrishnan venkatesan
Gopalakrishnan venkatesan 2015-8-12
编辑：Stephen23 2015-8-12
It works well
Can give me the small explanation of expression
Thanks a lot
Stephen23
Stephen23 2015-8-12
编辑：Stephen23 2015-8-12
^ % match start of string
[^a-z] % match any character EXCLUDING lower-case
+ % repeated one or more times
$ % match end of string
These are all explained in the documentation:
http://www.mathworks.com/help/matlab/matlab_prog/regular-expressions.html

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更多回答（1 个）

Azzi Abdelmalek
Azzi Abdelmalek 2015-8-12
编辑：Azzi Abdelmalek 2015-8-12
out=a(cellfun(@(x,y) isequal(x,y),a,upper(a)))
or
out=cell(size(a))
idx=cellfun(@(x,y) isequal(x,y),a,upper(a))
out(idx)=a(idx)

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