正则表达式匹配_或字符串结尾 [英] Regex to match _ or end of string

问题描述

我正在使用MATLAB的regexp()，并且试图找到一个仅与包含Cyto而不与CytoBlue的文件名匹配的正则表达式.我的问题是文件名看起来像Texture_Variance_Cyto_4_90和Texture_Variance_CytoBlue_4_90或HIST_9BinsHistBin7_Cyto和HIST_9BinsHistBin7_CytoBlue.

I'm working with MATLAB's regexp() and I'm trying to find a regular expression that would match only file names containing Cyto but not CytoBlue. My problem is that the file names look either like Texture_Variance_Cyto_4_90 and Texture_Variance_CytoBlue_4_90, or HIST_9BinsHistBin7_Cyto and HIST_9BinsHistBin7_CytoBlue.

如果我只是尝试匹配Cyto，我还将捕获所有包含CytoBlue的文件.如果尝试匹配Cyto_，则会错过文件名，其中Cyto是最后一个元素.我想我需要说匹配_或字符串的末尾"的内容.我尝试了Cyto[_\Z]，但是那行不通，我再次错过了所有以Cyto结尾的元素.

If I just try to match Cyto, I also capture all the files containing CytoBlue. If I try to match Cyto_, I miss the file names where Cyto is the last element. I guess I'd need something that says "match either _ or the end of the string". I tried Cyto[_\Z] but that does not work, I again miss all the elements that ends with Cyto.

推荐答案

Cyto(?=$|_)

此匹配Cyto，后跟("(?=...)")字符串("$")或_的末尾.请注意，下划线不会作为匹配的一部分返回.

This matches Cyto, followed by ("(?=...)") the end of the string ("$") or _. Note that the underscore is not returned as part of the match.

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