str_replace不能代替所有实例，但是gsub可以吗? [英] str_replace doesn't replace all occurrences, but gsub does?

问题描述

我正在尝试从下面的字符串中删除括号.

I am trying to remove brackets from a string like the one below.

library(stringr)

x <- "(Verhoeff,1937)"

str_replace(string = x, pattern = "(\\()|(\\))", replacement = "")
[1] "Verhoeff,1937)"

gsub(pattern = "(\\()|(\\))", replacement = "", x = x)
[1] "Verhoeff,1937"

str_replace似乎找不到右括号? 有什么想法吗?

str_replace doesn't seem to find the closing bracket? Any ideas why?

推荐答案

它仅与第一次出现匹配，而gsub则全部匹配.使用str_replace_all代替:

It only matches the first occurency, whereas gsub does it all. Use str_replace_all instead:

str_replace(string = "aa", pattern = "a", replacement = "b") # only first

str_replace_all(string = "aa", pattern = "a", replacement = "b") # all

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