awk extract multiple groups from each line

Question

How do I perform action on all matching groups when the pattern matches multiple times in a line?

To illustrate, I want to search for /Hello! (\\d+)/ an

Answer 1

GNU awk

awk 'BEGIN{ RS="Hello! ";}
{
    gsub(/[^0-9].*/,"",$1)
    if ($1 != ""){ 
        print $1 
    }
}' file