Regular Expression to extract bigram

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'

[Walter Roberson]

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]

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'

Answer 1

[Azzi Abdelmalek]

EDIT

Do you want?

string = 'ab bc cd ef gh ij kl'
regexp(string,'\s+','split');

[arun]

@Azzi Abdelmalek

No i want the

• 'ab bc'
• 'bc cd'
• 'cd ef'
• 'ef gh'
• 'gh ij'
• 'ij kl'as output

[Azzi Abdelmalek]

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]

Thanks @Azzi Abdelmalek

for your answer.

Answer 2

[Andrei Bobrov]

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