Recognize Number/Special Characters

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Nil
Nil 2011-11-8
Hi,
I have below input string and from it I want to recognize digits/special characters, May be some flag can be set
txt='har23#$'
Like if alphabet then flag=1 and for digits/Special Characters flag=0
Pls provide me some direction..
Thanks in Advance..
  1 个评论
Sven
Sven 2011-11-8
Have you used regular expressions before? They can be quite useful.
txt='har23#$';
badChars = regexp(txt,'[^A-Za-z0-9]');
if isempty(badChars)
disp 'All valid characters'
else
fprintf('Bad characters detected: %s\n', txt(badChars))
end

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采纳的回答

Walter Roberson
Walter Roberson 2011-11-8
txtisalpha = ismember(txt, ['a':'z', 'A':'Z']);
Then txtisalpha will be a vector with true for English letters and false for other characters (including spaces).

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