dplyr filter regex grepl case code example

Example 1: filter grepl r

df1 %>% filter(!grepl("^x|xx$", fruit))
###
    fruit group
1   apple     A
2  orange     B
3 banxana     A
4 appxxle     B

Example 2: grepl filter r

df1 %>% filter(!grepl("^x|xx$", fruit))