Stringr 模式环顾四周：R

Question

我正在尝试提取与特定模式匹配的子字符串。例如：

str <- "For each of the following statements, please indicate how true it is for\r\nyou with respect to your interaction with the puzzles in the game. - This is the part of string I want to extract."
str_extract(str, pattern = "(?<=-)\w+") #Output = This

如何获取整个字符串？

Answer 1

如果我们想提取整个句子直到 .，匹配一个或多个不是 . ([^.]+) 后跟 [=11= 的字符]（\. - 转义，因为它是匹配任何字符的元字符）在正则表达式环视之后匹配 - 和 space (\s)

library(stringr)
str_extract(str, pattern = "(?<=-\s)[^.]+\.")
[1] "This is the part of string I want to extract."

Stringr 模式环顾四周：R

Stringr pattern look around: R

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