R: How to split list into several numbers and do the calculation?

Question

my data is like: -3+2 41-12 after separating each part by using the following code: eg.

text = \'-3+2\'

pattern = \'-?\\\\d+\'
matches = gre         


        

Answer 1

or from your list, after parsing:

sapply(a, function(x) sum(as.numeric(x)))