在R中的另一个字符串中查找一个字符串 [英] Find a string in another string in R

问题描述

我想在R中的另一个字符串中找到一个字符串.字符串如下.我希望能够将字符串 a 与字符串 b 匹配，并且输出应该是 a == b ，它返回 TRUE

I want to find a string within another string in R. The strings are as follows. I want to be able to match string a to string b as and the out put should be a == b which returns TRUE

a <- "6250;7250;6251"
b <- "7250"
a == b                 #FALSE

推荐答案

如果 b 等于 725 而不是 7250，你还希望结果是 <代码>正确?

If b were to equal 725 instead of 7250, would you still want the result to be TRUE?

如果是这样，那么已经给出的 grepl 答案将起作用(您可以通过设置 fixed=TRUE 来加快速度，因为没有要匹配的模式.

If so then the grepl answer already given will work (and you could speed it up a bit by setting fixed=TRUE since there are no patterns to be matched.

如果您只希望 TRUE 与 ; 之间的某些内容完全匹配，那么您将需要将 b 嵌入到常规中表达式(sprintf 可能有帮助)，或者更简单，使用 strsplit 将 a 拆分为仅要匹配的部分，然后使用 %in% 查看 b 是否与这些值中的任何一个匹配.

If you only want TRUE when there is an exact match to something between ; then you will either need to embed b into a regular expression (sprintf may be of help), or simpler, use strsplit to split a into just the parts to be matched, then use %in% to see if b is a match to any of those values.

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