Can I use stringmatch, if I am looking for a match at the end of a string??

Question

Ines 2012-4-3

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/34441-can-i-use-stringmatch-if-i-am-looking-for-a-match-at-the-end-of-a-string

Hello everybody, I have a dataset of strings with a structure 'product_reaction_parameter' and I want to check whether a specified string (e.g. 'parameter2' is contained in the string, how can I do that? Strmatch only looks for matches at the beginning of the string but I wanna look for matches in the middle or at least in the end...the output I need is the row index as it is obtained when using conventional strmatch.

Would really appreciate any kind of advice, I am a Chemist and thus not very well-trained in programming :)

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Geoff 2012-4-3

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/34441-can-i-use-stringmatch-if-i-am-looking-for-a-match-at-the-end-of-a-string#answer_43188

在 MATLAB Online 中打开

You should use regular expressions for this.

doc regexp

They are far more powerful than simple string matching, but you can use them for that purpose:

idx = regexp(s, 'parameter2$');
if ~isempty(idx)
  disp('Found parameter2');
end

The $ matches at the end of the string.

You can also use regexp to split your string up into its parts:

tokens = regexp(s,'(.*)_(.*)_(.*)', 'tokens')

And then use straight string comparison on the third token.

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Geoff 2012-4-3

This will also work on a cell-array of strings, matching each row. It returns an array of indices for the position where the string was matched. To turn that into a row index into your cell, you do this:

rows = find(cellfun(@(x) ~isempty(x), regexp(s, 'parameter2$')));

请先登录，再进行评论。