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

Another solution:

strings <- c('ABC Conference Room Monitor - Z5580J','ABC 19 Monitor','ABC 24 Monitor for Video-Conferencing','ABC UltraSharp 24 Monitor -QU2482Z')
x <- as.numeric(gsub("\\D", "", strings))
as.numeric(substring(as.character(x*100), 1, 2))

[1] 55 19 24 24