Separate numbers from text

Note that this will replace all + - . and e E d D used as exponents, and that if there are multiple numbers separated by non-numbers then this will jam them together.

Another approach is

D = str2double( C(ismember(C, '0':'9')) );

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Answer 2

madhan ravi 2019-9-9

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https://ww2.mathworks.cn/matlabcentral/answers/479492-separate-numbers-from-text#answer_390960

编辑：madhan ravi 2019-9-9

在 MATLAB Online 中打开

C = str2double(regexprep(C,'[a-zA-Z^()]','')).'

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Walter Roberson 2020-2-22

There is a maxim in computer reliability and security engineering:

"Do not validate input by rejecting characters or patterns: only ever validate input by accepting characters or patterns that you know you can deal with."

When you work by rejecting things, then there is the possibility that you forgot to reject something, or that later some new method will be introduced that permits the user to slip new values past your validation. For example the pattern [a-zA-Z^()] does not reject & or ; or # or % so it would be happy to pass through A or %41 and a later step might do the translation to A or A .

There was a whole spate of security problems when unicode encoding was added to the HTML standard: code that validated by rejecting the old escape sequences stopped working when the libraries added a new escape sequence.

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