如何提取两个连字符之间的单词？

Question

如何提取 R 中两个连字符之间的所有内容

   ts = ("az_bna_njh","j_hj_lkiuy","ml_", "_kk")

我需要提取 bna、hj、ml 和 kk

Answer 1

我们可以使用

 sub("^\w+_(\w+)_.*", "\1", trimws(ts, whitespace = "_"))
 #[1] "bna" "hj"  "ml"  "kk"

或者另一种选择是

 sub("^\w+_(\w+)_.*", "\1", gsub("^_|_$", "", ts))

Answer 2

你也可以试试：

#Data
ts = c("az_bna_njh","j_hj_lkiuy","ml_", "_kk")
#Code
gsub(".*_(.*)\_.*", "\1", trimws(ts,whitespace = '_'))

输出：

[1] "bna" "hj"  "ml"  "kk"

Answer 3

您可以尝试另一种方法

library(stringr)
str_replace_all(ts, c("^.*_(\w+)_.*$" = "\1", "^_|_$" = ""))
#[1] "bna" "hj"  "ml"  "kk"

Ho to extract words between two hyphens?