Regexp for only numbers and "dots"

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!

Answer 1

[Mohammad Sami]

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]*$'));
% you can use it with dir to list all files in the folder
b = dir();
match = ~cellfun(@isempty,regexp({b.name},'^[\.0-9]*$'));

[Dale Black]

Thank you!

[Walter Roberson]

match = cellfun(@(F) all(ismember(F, ['0':'9', '.'])), a)

Be careful with dir, though, as it will have '.' and '..' entries and those follow the rule of containing only dots and numbers (since you do not require that at least one number be present.)

[Mohammad Sami]

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]

Thank you. I don't have the newest version so I didn't try that but the first option works and avoided the .. . problem.