simple - Regex patrón múltiple con reemplazo singular

regex specific characters

Question

Estoy tratando de reemplazar tanto "st". y "ste". con "st". Parece que lo siguiente debería funcionar pero no lo hace:

require("stringr")
county <- c("st. landry", "ste. geneveve", "st. louis")
str_replace_all(county, c("st//.", "ste//."), "st")

Answer 1

Puede utilizar | significar "o"

> str_replace_all(county, "st//.|ste//.", "st")
[1] "st landry"   "st geneveve" "st louis"   

O en la base R

> gsub("st//.|ste//.", "st", county)
[1] "st landry"   "st geneveve" "st louis"  

Answer 2

> A<-"this string,  contains a handful of,  useless:  punctuation.  Some are to escape.  Aaargh! Some might be needed,  but I want none!"
> gsub(", |: |//. |!","",A)
[1] "this string contains a handful of useless punctuation Some are to escape Aaargh Some might be needed but I want none"