Remove all special characters from a string in R?

R remove character from string, but for this you have to use the string_replace_all function from the stringr package as follows:

To remove all the punctuation characters:
x <- "a1~!@#$%^&*(){}_+:"<>?,./;'[]-="
str_replace_all(x, "[[:punct:]]", " ")
[1] "a1~   $ ^       +  <>         ="
To remove all the non-alphanumeric characters:
 str_replace_all(x, "[^[:alnum:]]", " ")
[1] "a1 
You can also use the gsub function from the base package as follows:
gsub("[^[:alnum:]]", " ", x)
[1] "a1