Creating a new list by combining element of previous list in R -


i have list this:

    v = list(a1= 1, a2 = 2, b1 = 3, b2= 4, b3 = 5)

my desire result creating list :

   v = list(a = c(1, 2), b = c(3, 4, 5))

but should mentioned vector v exapmle, can wrote code above example, problem if each time length of ai , biis different, how can wrote function desire result in r? 

split(unlist(v), sub("\\d+$", "", names(v))) # $a # a1 a2  #  1  2  #  # $b # b1 b2 b3  #  3  4  5

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