Regular Expression to extract bigram

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arun
arun 2013-9-26
回答： Andrei Bobrov 2013-9-26
string = 'ab bc cd ef gh ij kl'
what will be the regular expression to extract bigram from the given string
I am writing the code
regexp(string,'\w* \w*','match');
the o/p is coming as: 'ab bc' 'cd' 'ef' 'gh' 'ij' 'kl'
while the output i am expecting as:
  • 'ab bc'
  • 'bc cd'
  • 'cd ef'
  • 'ef gh'
  • 'gh ij'
  • 'ij kl'
  2 个评论
Walter Roberson
Walter Roberson 2013-9-26
I believe the term is "bi-gram".
If the string was
'abc defg'
would you want the result to be
ab bc c<space> <space>d de ef fg
or
ab de
or
ab bc de ef fg
?
Or does it only need to work on letter pairs ?
arun
arun 2013-9-26
yes you are saying right but i want to do it on word level and when i am writing the regexp as:
regexp(string,'\w+ \w+','match')
the o/p is: ans =
'ab bc' 'cd ef' 'gh ij'

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采纳的回答

Azzi Abdelmalek
Azzi Abdelmalek 2013-9-26
编辑：Azzi Abdelmalek 2013-9-26
EDIT
Do you want?
string = 'ab bc cd ef gh ij kl'
regexp(string,'\s+','split');
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Azzi Abdelmalek
Azzi Abdelmalek 2013-9-26
string = 'ab bc cd ef gh ij kl'
out=regexp(string,'\s+','split');
cellfun(@(x,y) [x ' ' y],out(1:end-1)', out(2:end)','un',0)
arun
arun 2013-9-26
Thanks @Azzi Abdelmalek
for your answer.

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更多回答（1 个）

Andrei Bobrov
Andrei Bobrov 2013-9-26
z=regexp(string,'\w*','match')
strcat(z(1:end-1),{' '},z(2:end))

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