ref: 10e72d182aad860492f6ec2e80b0c05a4dc20b7a dir: /test/t.re3/
{ r1 = $1 r2 = $1 ":" } length(r1) && $0 ~ r1 { print $0 " matches " r1 } length(r1) && $0 ~ r2 { print $0 " matches " r2 }