[R] Subset a column with specific characters

[Kuma Raj]

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I would like to subset a column based on the contents of a column with
specific character. In the sample data I wish to do the following:

First keep the data based on column "prog" if prog contains "ca", and
secondly to drop if race contains "ic"

Thanks

library(foreign)
hsb2 <- read.dta('http://www.ats.ucla.edu/stat/stata/notes/hsb2.dta')