gsub in R with case condition in R -

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i have data : pes + pea + pwh

i want use gsub or other function in r such -- if there pea in data keep pea (and pwh should kept too) , remove pes

so ideally condition should involve pea , pes.

final output : pea + + pwh thanks!

the question easier answer if provide sample data set. assuming intention replace strings taking account capitals ignore.case = false should enough. example:

x <- "pes + pea + pwh + pes" gsub("pes","new text",x, ignore.case = false)

would give you:

[1] "new text + pea + pwh + pes"

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