How to read only vowels of a string

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Balkar Singh 2020-4-24

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https://ww2.mathworks.cn/matlabcentral/answers/520503-how-to-read-only-vowels-of-a-string

评论： Balkar Singh 2020-4-27

采纳的回答： Tommy

How can I read only vowels of a string by using regular expression in matlab. Thanks in advance.

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采纳的回答

Tommy 2020-4-24

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https://ww2.mathworks.cn/matlabcentral/answers/520503-how-to-read-only-vowels-of-a-string#answer_428184

编辑：Tommy 2020-4-24

在 MATLAB Online 中打开

>> regexprep('How to read only vowels of a string?', '[^aeiouAEIOU]', '')
ans =
    'ooeaooeoai'
>> char(regexp('How to read only vowels of a string', '[aeiouAEIOU]', 'match'))'
ans =
    'ooeaooeoai'

(edit) No longer ignoring capitals!

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Tommy 2020-4-26

在 MATLAB Online 中打开

Certainly, if you have the trimmed down character vector:

vowels = regexprep('How to read only vowels of a string?', '[^aeiouAEIOU]', '')
%{
vowels =
    'ooeaooeoai'
%}

you could use histc:

bins = sort('aeiouAEIOU');
counts = histc(double(vowels), double(bins));
for v = bins
    fprintf('%c: %d\n', v, counts(bins==v));
end
%{
A: 0
E: 0
I: 0
O: 0
U: 0
a: 2
e: 2
i: 1
o: 5
u: 0
%}