MATLAB Answers

Yu Li
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regexp problem in '.'

Asked by Yu Li
on 8 Jan 2019
Latest activity Commented on by Yu Li
on 8 Jan 2019
I have a string and I want to split it with '.', but the regexp does not work.
test='abcde.abcde';
regexp(test,'.','split')
but it does not work, the result is a 1*12 cell array.
however, if I replace the '.' with other symbol, such as '_', the regexp function works properly.
test='abcde_abcde';
regexp(test,'_','split')
just want know if there is any mistake with my operation? or, is this a feature in 'regexp' function?
Thanks!
Yu

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1 Answer

per isakson
Answer by per isakson
on 8 Jan 2019
Edited by per isakson
on 8 Jan 2019
 Accepted Answer

Try
%%
test='abcde.abcde';
regexp(test,'\.','split')
returns
ans =
1×2 cell array
{'abcde'} {'abcde'}
dot stands for any single character. An escape is needed to a literal dot.

  3 Comments

Yu Li
on 8 Jan 2019
Thank for your answer, the problem has been solved.
could you please explain why this happens and why your answer works?
Thanks!
Yu
per isakson
on 8 Jan 2019
dot is a Metacharacters, see the documentaion, which says:
. Any single character, including white space, '..ain' matches sequences of five consecutive characters that end with 'ain'.
Yu Li
on 8 Jan 2019
Thank you!
Bests,
Yu

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