Regexp: different behavior for the same type of expressions

조회 수: 1(최근 30일)
I want to capture everything except the tokens:
name, '_' and '.iv2'
name =
A7122
>> filename'
ans =
'A7122_60a.iv2'
'A7122_60b.iv2'
'A7122_70a.iv2'
'A7122_70b.iv2'
'A7122_90a.iv2'
'A7122_90b.iv2'
'A7122_100.iv2'
'A7122_120.iv2'
I do this:
str=regexp(filename, [ '(?:[^' name '_])\w*(?:[^.iv2])' ], 'match');
And the answer is the following!
>> celldisp(str)
str{1}{1} =
60a
str{2}{1} =
60b
str{3}{1} =
0a
str{4}{1} =
0b
str{5}{1} =
90a
str{6}{1} =
90b
str{7}{1} =
00
str{8} =
{}
I don't understand why regexp has a different behavior for i.e. in filename(1) and filename(3)
  댓글 수: 2
Giorgos Papakonstantinou
Giorgos Papakonstantinou 2013년 9월 20일
Thank you very much Cedric! Very nice explanation!

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채택된 답변

Vishal Rane
Vishal Rane 2013년 9월 19일
편집: Vishal Rane 2013년 9월 19일
You can use:
regexprep( filename, [ name, '_|.iv2'], '')
Also
regexp( filename, [ name, '_(\w*).iv2'], 'tokens')
  댓글 수: 1
Giorgos Papakonstantinou
Giorgos Papakonstantinou 2013년 9월 19일
Thank you Vishal! Much more compact syntax! However, do you know why regexp has this behavior?

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추가 답변(1개)

Andrei Bobrov
Andrei Bobrov 2013년 9월 19일
편집: Andrei Bobrov 2013년 9월 19일
str = {'A7122_60a.iv2'
'A7122_60b.iv2'
'A7122_70a.iv2'
'A7122_70b.iv2'
'A7122_90a.iv2'
'A7122_90b.iv2'
'A7122_100.iv2'
'A7122_120.iv2'}
cl = regexp(str,'(?<=_)\w*(?=\.)','match');
out = cat(1,cl{:});
  댓글 수: 2
Andrei Bobrov
Andrei Bobrov 2013년 9월 20일
Please read about regexp, parts:
- Regular expression :
about
Metacharacters ( \w ),
Quantifiers ( expr* ),
Lookaround Assertions ( expr(?=test) and (?<=test)expr )

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