stringr包基础操作
stringr构建在stringi之上，stringr专注于最重要且最常用的字符串操作函数，而stringi提供了涵盖几乎所有可以想象的内容的全面集合。 如果发现stringr缺少所需的功能，请尝试查看stringi。
安装
# Install the released version from CRAN:
install.packages("stringr")
# Install the cutting edge development version from GitHub:
# install.packages("devtools")
devtools::install_github("tidyverse/stringr")- 基础操作
x <- c("why", "video", "cross", "extra", "deal", "authority")
str_length(x)
#> [1] 3 5 5 5 4 9
str_c(x, collapse = ", ")
#> [1] "why, video, cross, extra, deal, authority"
str_sub(x, 1, 2)
#> [1] "wh" "vi" "cr" "ex" "de" "au"大多数字符串函数都使用正则表达式，这是一种用于描述文本模式的简洁语言。 例如，正则表达式“ [aeiou]”匹配作为元音的任何单个字符：
str_subset(x, "[aeiou]")
#> [1] "video" "cross" "extra" "deal" "authority"
str_count(x, "[aeiou]")
#> [1] 0 3 1 2 2 4- str_detect(x, pattern) tells you if there’s any match to the pattern.
str_detect(x, "[aeiou]")
#> [1] FALSE TRUE TRUE TRUE TRUE TRUE- str_count(x, pattern) 计数
str_count(x, "[aeiou]")
#> [1] 0 3 1 2 2 4- str_subset(x, pattern) 提取匹配的字符串
str_subset(x, "[aeiou]")
#> [1] "video" "cross" "extra" "deal" "authority"- str_locate(x, pattern) 定位匹配的字符串的位置
str_locate(x, "[aeiou]")
#> start end
#> [1,] NA NA
#> [2,] 2 2
#> [3,] 3 3
#> [4,] 1 1
#> [5,] 2 2
#> [6,] 1 1- str_extract(x, pattern) 提取字符串
- str_extract(x, "[aeiou]")
#> [1] NA "i" "o" "e" "e" "a"- str_match(x, pattern) 匹配字符串
# extract the characters on either side of the vowel
str_match(x, "(.)[aeiou](.)")
#> [,1] [,2] [,3]
#> [1,] NA NA NA
#> [2,] "vid" "v" "d"
#> [3,] "ros" "r" "s"
#> [4,] NA NA NA
#> [5,] "dea" "d" "a"
#> [6,] "aut" "a" "t"- str_replace(x, pattern, replacement) 替换字符串
str_replace(x, "[aeiou]", "?")
#> [1] "why" "v?deo" "cr?ss" "?xtra" "d?al" "?uthority"- str_split(x, pattern) 将字符串分割
str_split(c("a,b", "c,d,e"), ",")
#> [[1]]
#> [1] "a" "b"
#>
#> [[2]]
#> [1] "c" "d" "e"本文参与 腾讯云自媒体同步曝光计划，分享自作者个人站点/博客。
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