1BEGIN { r1 = "xxx" 2 r2 = "xxx" ":" 3 r3 = ":" r2 4 r4 = "a" 5} 6 7$0 ~ r1 { print $0 " matches " r1 } 8$0 ~ r2 { print $0 " matches " r2 } 9$0 ~ r3 { print $0 " matches " r3 } 10$0 ~ r4 { print $0 " matches " r4 } 11