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I have several objects in my global environment. I want to create a list of some of the objects in my environment. The objects that I want specifically have the two underscores in their names and p with a number at the end of it. For instance, this is an example of the names I have; "mom_big_p1", "mom_big_p2", "mom_big_p3", "mom_small_p1", "mom_small_p2", "mom_small_p3" and so on. There are other objects that have two underscores in their name like "mom_big_rank" but the only ones that have "name_size_p$" are the ones that I want.

When I try:

mom_size <- setNames(lapply(ls(pattern=".\\_p"), function(x) get(x)), ls(pattern=".\\_p"))

I get all of the objects I want but I also get objects that have only one underscore and a p after the underscore. Is there a way to match a pattern of two underscores with a string in between them?

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    Some "^[[:alnum:]]+_[[:alnum:]]+_[[:alnum:]]*[[:digit:]]+$" should do the job. Or, "^[[:alnum:]]+_[[:alnum:]]+_p[[:digit:]]+$" if the part before the last number is fixed. Commented Sep 15, 2019 at 19:33
  • if pat is the pattern then use mget(ls(pattern = pat), envir = .GlobalEnv) Commented Sep 15, 2019 at 19:57

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Sample environment:

vec <- c("mom_big_p1", "mom_big_p2", "mom_big_p3", "mom_small_p1", "mom_small_p2", "mom_small_p3", "mom_big_rank") sapply(vec, assign, 1, env=environment()) ls() # [1] "mom_big_p1" "mom_big_p2" "mom_big_p3" "mom_big_rank" "mom_small_p1" "mom_small_p2" # [7] "mom_small_p3" "vec"

List objects that match your pattern:

ls(pattern = "_.+_p\\d+$") # [1] "mom_big_p1" "mom_big_p2" "mom_big_p3" "mom_small_p1" "mom_small_p2" "mom_small_p3"

If you need something before the first underscore, try a pattern of ".+_.+_p\\d+$".

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