Remove groups that contain certain strings

Question

I have an issue about removing the groups that contain certain strings in its rows for example if includes .. I would like to achive this without breaking the p

Answer 1

Another option could be using %in% operator.

df %>% 
 filter(!(gr %in% unique(ifelse(grepl("\\.",vals),gr,NA) )))

#  vals gr
#1 good  1
#2  bad  1
#3 ugly  1

Answer 2

Here is one option in base R with subset and table

subset(df, gr %in% names(which(!table(gr, grepl("\\.", vals))[,2])))
#  vals gr
#1 good  1
#2  bad  1
#3 ugly  1

Answer 3

Maybe something like this:

df %>% group_by(gr) %>% filter(all(!grepl("\\.",vals)))

Answer 4

The OP has requested to remove the entire group when one of the group members contains a certain string in vals - without breaking the pipe.

The OP explicitely has stated: I mean without using any join function.

However, I believe using an anti-join does not break the pipe:

library(dplyr)
data.frame(vals, gr) %>% 
  anti_join(., filter(., grepl("\\.",vals)), by = "gr")

  vals gr
1 good  1
2  bad  1
3 ugly  1