part of file name

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ayman mounir
ayman mounir 2019-7-18
评论： ayman mounir 2019-7-19
If I have a file name such as ' Hello_World_2020 ', I want to take the part between the underscores ' world ', how I would do that.
Regards.

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采纳的回答

Walter Roberson
Walter Roberson 2019-7-18
编辑：Walter Roberson 2019-7-18
s = 'Hello_World_2020';
c = regexp(s, '_', 'split') ;
c{2}
You can also use strsplit() instead of regexp. On the other hand, strsplit() invokes regexp internally.
  3 个评论
显示 1更早的评论
Adam Danz
Adam Danz 2019-7-19
"If I write s=Hello_World_year_2020. the answer would be 'Hallo_year'. what I should modify?"
@ayman, it's not clear what rules you're following.
  • "Hello_World_2020" --> "World": This removes everything before and after the underscores, including the underscores.
  • "Hello_World_year_2020" --> "Hello_year": This doesnt' follow that rule.
I think Walter's solution will come in handy but you'll need to explain the rule you're following.
ayman mounir
ayman mounir 2019-7-19
clear, thanks

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更多回答（3 个）

Adam Danz
Adam Danz 2019-7-18
s = 'Hello_World_2020';
c = regexp(s,'_(.*)_','tokens');
c = c{1}{1};
c =
'World'
madhan ravi
madhan ravi 2019-7-18
s=' Hello_World_2020 ';
[~,Wanted]=regexp(s,'_(.*)_','match','tokens');
Wanted{:}
  2 个评论
ayman mounir
ayman mounir 2019-7-19
Thanks, It is really helpful, woudl mind to explain how the exprsion works. for exmaple If I write s=Hello_World_year_2020. the answer would be 'Hallo_year'. what I should modify?
Regards
madhan ravi
madhan ravi 2019-7-19
As Adam commented , I had the same thoughts too straight away.

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Jan
Jan 2019-7-19
s = ' Hello_World_2020 '
c = strsplit(s, '_')
c{2}

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