fixed	fixed
ignore.case	ignore.case
invert_match	invert_match
perl	perl
str_c	str_c
str_count	str_count
str_detect	str_detect
str_dup	str_dup
str_extract	str_extract
str_extract_all	str_extract_all
str_join	str_c
str_length	str_length
str_locate	str_locate
str_locate_all	str_locate_all
str_match	str_match
str_match_all	str_match_all
str_pad	str_pad
str_replace	str_replace
str_replace_all	str_replace_all
str_split	str_split
str_split_fixed	str_split_fixed
str_sub	str_sub
str_sub<-	str_sub_replace
str_sub_replace	str_sub_replace
str_trim	str_trim
str_wrap	str_wrap
word	word
