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

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Elena 2022-2-24

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https://ww2.mathworks.cn/matlabcentral/answers/1657380-how-to-extract-a-value-with-a-specific-character-out-of-an-character-array

评论： DGM 2022-2-25

采纳的回答： DGM

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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Answer 1

DGM 2022-2-24

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编辑：DGM 2022-2-24

在 MATLAB Online 中打开

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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Rik 2022-2-24

在 MATLAB Online 中打开

mailhost1each=strrep(mailhost1each,'@earthlink.com','@earthlink.net');

DGM 2022-2-25

在 MATLAB Online 中打开

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'}