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

in your particular case (2 numbers):

as.integer(a[[1]][1]) + as.integer([[1]][2])

More generally:

sum(sapply(a[[1]], as.integer))