Extracting part of a string after the nth occurrence of a character

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Cecile
Cecile 2018-1-10
评论： Cecile 2018-1-11
Hello,
I have a cell array of string which looks like this:
cellArrayS = {'staticString1;staticString2;staticString3;1;nextString'; ... 'staticString1;staticString2;staticString3;2;nextString;nextString'; ... 'staticString1;staticString2;staticString3;3;nextString;nextString;nextString'; ... 'staticString1;staticString2;staticString3;4;nextString;;;;'; ... 'staticString1;staticString2;staticString3;5;nextString;nextString'};
I would like to extract all the characters after the 4th semi-column until the end of the string. The results would be as follow:
extractResults =
'nextString';
'nextString'; 'nextString';
'nextString'; 'nextString'; 'nextString';
'nextString';;;;
'nextString'; 'nextString';
I have tried looking at related example on this question, playing around with regexp, find and extractAfter but I didn’t manage to get anywhere.
Thank you very much.
Cecile

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采纳的回答

Stephen23
Stephen23 2018-1-10
C = {...
'staticString1'';''staticString2'';''staticString3'';1;''nextString'';'
'staticString1'';''staticString2'';''staticString3'';2;''nextString'';''nextString'';'
'staticString1'';''staticString2'';''staticString3'';3;''nextString'';''nextString'';''nextString'';'
'staticString1'';''staticString2'';''staticString3'';4;''nextString'';;;;'
'staticString1'';''staticString2'';''staticString3'';5;''nextString'';''nextString'';'
};
T = regexp(C,'^(([^;]+;){4})(.*)$','once','tokens');
Z = cellfun(@(c)c{end},T,'uni',0);
giving:
>> Z{:}
ans = 'nextString';
ans = 'nextString';'nextString';
ans = 'nextString';'nextString';'nextString';
ans = 'nextString';;;;
ans = 'nextString';'nextString';

更多回答（1 个）

Walter Roberson
Walter Roberson 2018-1-10
pattern = '^(?[^;]*;){4}';
extractResults = regexprep(CellArrayS, pattern, '', 'lineanchors')
  1 个评论
Cecile
Cecile 2018-1-10
Thank you very much Walter. extractResults looks exactly like the original cellArrayS when I try your example above. I guess the pattern regular expresion needs to be edited? I am not able to read it unfortunately to see where the issue is. Would you be able to take another look? Thank you very much.

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