R - 在包含字符串的字符数组中查找元素

I want to extract the elements of a character array that contains some particular string. For example:

我想提取包含某些特定字符串的字符数组的元素。例如：

x <- c('aa', 'ab', 'ac', 'bb', 'bc')

I want some function such that, given x and 'a'(in general this can be a string), it returns 'aa', 'ab', 'ac'. I have experimented with a combination of %in%, match, which, etc, but have not been able to make them work. Any idea?

我想要一些函数，给定x和'a'（通常这可以是一个字符串），它返回'aa'，'ab'，'ac'。我已经尝试了％in，match，which等的组合，但是还没能使它们工作。任何想法？

1 个解决方案

#1

Just use grep:

只需使用grep：

grep('a', x, value=TRUE)
[1] "aa" "ab" "ac"