Proper use of regexprep

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GEORGIOS BEKAS
GEORGIOS BEKAS on 22 Jan 2018
Commented: per isakson on 17 Dec 2018
I want to remove the consonants of a string, using regexprep. How can I modify the initial string s1 with a string s2?
s2 = regexprep(s1,'qwrtpsdfghjklzxcvbnmQWRTPSDFGHKLZXCVBNM','')
  2 Comments
per isakson
per isakson on 17 Dec 2018
Your statement is lacking the square brackets. Try
s2 = regexprep(s1,'[qwrtpsdfghjklzxcvbnmQWRTPSDFGHKLZXCVBNM]','')

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Accepted Answer

KL
KL on 22 Jan 2018
Edited: KL on 22 Jan 2018
use the ^ operator. It should simply be,
s2 = regexprep(s1,'[^aeiou]','')
documentation explains it clearly here: https://de.mathworks.com/help/matlab/ref/regexprep.html
  3 Comments
KL
KL on 22 Jan 2018
it removes every character except what you mention inside the square brackets following ^ sign.
s2 = regexprep(s1,'[^aeiouA-Z]','') %ignores capital letters (A-Z)
s2 = regexprep(s1,'[^aeiouA-Z\s]','') %ignores white spaces as well
I gave you the link to documentation. It explains much more and guess what, even with examples!

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More Answers (1)

the cyclist
the cyclist on 22 Jan 2018
Edited: the cyclist on 22 Jan 2018
Can you just do
s1 = s2;
after that? Or just
s1 = regexprep(s1,'qwrtpsdfghjklzxcvbnmQWRTPSDFGHKLZXCVBNM','');
directly, eliminating creating the intermediate variable s2?

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