How to ascertain number of special characters in a string?
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If there is array containing 5 different strings, how can I ascertain the number of special characters in each separate string?
回答（2 个）
Jeff E
2013-11-8
blah = ' This line contains * some & special ( chars_!@#';
idx = regexp(blah, '_|!|\*');
special_count = size(idx, 2);
1 个评论
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 "["
Azzi Abdelmalek
2013-11-8
s={'abc/d?' 'abcd' 'Abc123\'}
out=cellfun(@numel,regexp(s,'[^a-zA-A0-9]+','match'))
3 个评论
Walter Roberson
2013-11-8
Space is not usually considered to be a "special character". Characters in non-Roman alphabets are not usually considered to be special characters either. For example "é" would normally be considered an alphabetic character rather than a "special character".
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
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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2013-11-9
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