Regexp for only numbers and "dots"

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Dale Black
Dale Black 2021-3-11
评论： Dale Black 2021-3-13
I have filenames like "999.999.1.20020318.133002.0" and I want to look through folders and move files with this naming scheme (only numbers and periods). Any idea how this could be done? I tried something like strcmp and contains but I cannot figure out how to get it to work.
Thanks in advance!

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Mohammad Sami
Mohammad Sami 2021-3-11
You can use a regex like the following. this one will catch all digits and dots. The ^ in beginning and $ at the end ensure that it matches the entire name.
a = {'somname.txt' '999.999.1.20020318.133002.0'};
match = ~cellfun(@isempty,regexp(a,'^[\.0-9]*$'));
% you can use it with dir to list all files in the folder
b = dir();
match = ~cellfun(@isempty,regexp({b.name},'^[\.0-9]*$'));
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Mohammad Sami
Mohammad Sami 2021-3-11
编辑：Mohammad Sami 2021-3-11
As noted in Walter's comment, dir will contain '.' and '..' as entries.
Assuming that first character must always be a digit, you can change the regex expression as follows.
b = dir();
match = ~cellfun(@isempty,regexp({b.name},'^\d[\.\d]*$'));
% substituted \d for 0-9
Also if you R2020b, you can use the new pattern functionality as follows.
b = dir();
match = matches({b.name},regexpPattern('^\d[\.\d]*$'));
Dale Black
Dale Black 2021-3-13
Thank you. I don't have the newest version so I didn't try that but the first option works and avoided the .. . problem.

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