grepl在R中没有正确搜索

Question

I want to search ".com" in a vector, but grepl isn't working out for me. Anyone know why? I am doing the following

vector <- c("fdsfds.com","fdsfcom")
grepl(".com",vector)

This returns

[1] TRUE TRUE

I want it to strictly refer to "fdsfds.com"

Answer 1

As @user20650 said in the comments above, use grepl("\\\\.com",vector) . the dot ( . ) is a special character in regular expressions that matches any character, so it's matching the second "f" in "fdsfcom". The "\\\\" before the . "escapes" the dot so it's treated literally. Alternatively, you could use grepl(".com",vector, fixed = TRUE) , which searches literally, not using regular expressions.