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How to ascertain number of special characters in a string?

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Kelsey
Kelsey 2013-11-8
评论： Walter Roberson 2013-11-9
If there is array containing 5 different strings, how can I ascertain the number of special characters in each separate string?

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回答（2 个）

Jeff E
Jeff E 2013-11-8
blah = ' This line contains * some & special ( chars_!@#';
idx = regexp(blah, '_|!|\*');
special_count = size(idx, 2);
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Walter Roberson
Walter Roberson 2013-11-8
I would simplify the pattern to '[_!*]' instead of '_|!|\*'
If you do use [] then if you have "-" (dash, minus sign) in the list, ensure that it is either right after the "[" or right before the "[". Also if you include "^" in the list, ensure that it is not right after the "["

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Azzi Abdelmalek
Azzi Abdelmalek 2013-11-8
s={'abc/d?' 'abcd' 'Abc123\'}
out=cellfun(@numel,regexp(s,'[^a-zA-A0-9]+','match'))
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Azzi Abdelmalek
Azzi Abdelmalek 2013-11-8
编辑：Azzi Abdelmalek 2013-11-8
s={'abc/d?' ' abé cd' 'Abc123\'}
out=cellfun(@numel,regexp(s,'[^\w\s]+','match'))
Walter Roberson
Walter Roberson 2013-11-9
\w Any alphabetic, numeric, or underscore character. For English character sets, \w is equivalent to [a-zA-Z_0-9]
Notice that includes underscore.
Also the wording there hints that what \w matches might be locale-dependent, such as LANG=en-CA (Canadian English) perhaps having \w match something different than LANG=en-FR (Canadian French)

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