Extract first N digits from a string

Question

I want to extract just FIRST TWO DIGITS from some strings. Suppose the data is :

ABC Conference Room Monitor - Z5580J    
ABC 19 Monitor    
ABC 24 Monitor f         


        

Answer 1

Solution using regex \\D to match non-digit characters and \\d{2} to match first two digits.

as.numeric(sub("\\D*(\\d{2}).*", "\\1", INPUT))
# [1] 55 19 24 24

data:

INPUT <- c("ABC Conference Room Monitor - Z5580J",
           "ABC 19 Monitor",
           "ABC 24 Monitor for Video-Conferencing",
           "ABC UltraSharp 24 Monitor -QU2482Z")