在R中是否可以在向量中搜索正则表达式,就好像所有元素都是折叠的单个元素一样？如果我们将所有元素折叠成一个来做这个,那么在搜索之后就不可能将它们放回到它们的元素形式.
这是一个向量.
vector<-c("I","met","a","cow")
假设我的任务是合并搜索字符串所在的两个元素.
所以我期待的是：
vector = "I","Meta","cow"
是否有可能做到这一点？请帮忙.
如果你想要一些匹配“Meta”而不是“taco”的东西,这就可以了：
原文链接：https://www.f2er.com/regex/356944.htmlmyFun <- function(vector,word) {
D <- "UnLiKeLyStRiNg"
## Construct a string on which you'll perform regex-search
xx <- paste0(paste0(D,vector,collapse=""),D)
## Construct the regex pattern
start <- paste0("(?<=",D,")")
mid <- paste0(strsplit(word,"")[[1]],collapse=paste0("(",")?"))
end <- paste0("(?=",")")
pat <- paste0(start,mid,end)
## Use it
strsplit(gsub(pat,word,xx,perl=TRUE),D)[[1]][-1]
}
vector <- c("I","cow")
myFun(vector,"Meta")
# [1] "I" "Meta" "cow"
myFun(vector,"taco")
# [1] "I" "met" "a" "cow"
myFun(vector,"Imet")
# [1] "Imet" "a" "cow"
myFun(vector,"Ime")
# [1] "I" "met" "a" "cow"
