在R中的另一个字符串中找到一个字符串 [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。这些字符串如下。我希望能够将字符串a与字符串b进行匹配，并且输出应该为 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 ，您是否仍希望结果为 TRUE ？

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 答案就可以了（您可以通过设置 fixed = TRUE ，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.

如果您只想 TRUE 当之间完全匹配； 时，您要么需要嵌入 b 转换为正则表达式（ sprintf 可能有帮助），或更简单的方法是，使用 strsplit 拆分 a 放入要匹配的部分，然后使用％in％查看是否 b 与这些值中的任何一个都匹配。

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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