how to extract a value with a specific character out of an character array

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Elena
Elena 2022-2-24
评论： DGM 2022-2-25
a great example to describe this would be for emails. Say we have an input of:
emails = 'someone, random@gmail, other'
how would one know to select the one with the @gmail and then add the .com to the end after?
If there are multiple emails in the array, only display the first one.

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DGM
DGM 2022-2-24
编辑：DGM 2022-2-24
Ran in:
I'm not sure which extra emails should be rejected. I'm going to assume that all other emails get rejected
emails = {'someone, random@gmail, backupaccount@yahoo, other';
'someone else, random2@hotmail, other'};
mailhost = regexp(emails,'@[^,]*','match');
mailhost1all = [mailhost{1}{1} '.com']
mailhost1all = '@gmail.com'
If instead there might be more than one email per entry in the emails array, and you only want the first email per entry in the array:
mailhost1each = cell(numel(emails),1);
for acct = 1:numel(emails)
mailhost1each{acct} = [mailhost{acct}{1} '.com'];
end
mailhost1each
mailhost1each = 2×1 cell array
{'@gmail.com' } {'@hotmail.com'}
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DGM
DGM 2022-2-25
Ran in:
Maybe something like this?
emails = {'someone, random@gmail, backupaccount@yahoo, other';
'someone else, random2@earthlink, other'};
% match the whole email address
mailaccounts = regexp(emails,'[^,\s]*?@[^,]*','match');
% these hosts should be .net
hasnettld = {'earthlink','comcast','airmail','charter'};
hasnettld = cellfun(@(x) ['@' x],hasnettld,'uniform',false);
firstmailaccounts = cell(numel(emails),1);
for acct = 1:numel(emails)
thisacct = mailaccounts{acct}{1};
if contains(thisacct,hasnettld)
firstmailaccounts{acct} = [thisacct '.net'];
else
firstmailaccounts{acct} = [thisacct '.com'];
end
end
firstmailaccounts
firstmailaccounts = 2×1 cell array
{'random@gmail.com' } {'random2@earthlink.net'}
I'm sure this can be simplified, but I'm still not really sure what you want matched.

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