This is usually used to get the part of a file name that doesn't include the
file extension. It is vectorized over string. If there is no period in
string, the input is returned.
str_before_last_dot(string)A character vector.
Other bisectors:
before-and-after
str_before_last_dot(c("spreadsheet1.csv", "doc2.doc", ".R"))
#> [1] "spreadsheet1" "doc2" ""