> str_replace(val,"[ab]","-") [1]"-bc""123""c-a" # 把目标字符串所有出现的a或b,替换为- > str_replace_all(val,"[ab]","-") [1]"--c""123""c--" # 把目标字符串所有出现的a,替换为被转义的字符 > str_replace_all(val,"[a]","\1\1") ...
str_replace_na()函数可以将其替换成字符串"NA",从而方便对缺失值的操作。 na <- NA str_length(na) ## [1] NA txt2 <- str_replace_na(na) str_length(txt2) ## [1] 2 分解 类似Excel的分列操作,str_split()函数可以根据特定字符对字符串进行分解。语法结构如下: str_split(string, pattern, n...
> str_subset(x, pattern = 'oi') # character(0) > str_subset(x, pattern = '[oi]') [1] "video" "cross" "authority" 字符串替换 使用str_replace()进行特定字符的替换,参数包括要替换的模式pattern和替换成的模式replacement。 > x <- c("why", "video", "cross", "extra", "deal", "a...
str_replace_na()将缺失值转换为"NA";stri_replace()用于底层实现。 例子 fruits <- c("one apple","two pears","three bananas")str_replace(fruits,"[aeiou]","-")#> [1] "-ne apple" "tw- pears" "thr-e bananas"str_replace_all(fruits,"[aeiou]","-")#> [1] "-n- -ppl-" "tw-...
用str_to_sentece函数把字符转换为句子风格 1.5 去掉首尾空格 用str_trim函数去掉首位空格 1.6 空格填充字符串 用str_pad函数 1.7 字符串截断 用str_trunc函数把字符串截断为给定长度 代码演示 str_length("awefon8g-gn951nksjdg") chr_data <- c("Data","Daft","YouTube","channel", ...
搭配sapply 使用获得向量的前/后缀 如:add<-sapply(str_split(email,'@'),'[',1) str_replace(string,pattern,replacement) 只替换首次满足条件的子字符串 str_replace_all(string,pattern,replacement) 替换掉所有满足条件的字符串, 如 str_replace_all(commadata,',','' ...
str_sort(letters, locale = "en") str_replace(),字符串替换函数 str_replace(string, pattern, replacement) str_replace_all(string, pattern, replacement) str_replace_na(string, replacement = "NA") string:需要处理的字符向量 pattern:指定匹配模式, ...
library(stringr)string<-"I love cats and dogs."str_replace(string,"cats","rabbits")# 输出"I love rabbits and dogs." str_detect(): 判断字符串是否包含指定模式 该函数可以用于判断一个字符串是否包含指定的模式。其语法如下: str_detect(string,pattern) ...
str_sub(string, start = 1L, end = -1L) str_replace(string, pattern, replacement) #-提取字符串---hw <-"Hadley Wickham"> str_sub(hw,1,6)[1]"Hadley"> str_sub(hw, c(1,8), c(6,14))[1]"Hadley""Wickham"#--替换字符串---> fruits <- c("o...
str_replace_all: 字符串替换,同str_replace str_replace_na:把NA替换为NA字符串 str_locate: 找到匹配的字符串的位置。 str_locate_all: 找到匹配的字符串的位置,同str_locate str_extract: 从字符串中提取匹配字符 str_extract_all: 从字符串中提取匹配字符,同str_extract ...