ref: 8f2d3879a9c66d2633ca7ec1c3b0495981feb04f dir: /test/t.re3/
{ r1 = $1 r2 = $1 ":" } length(r1) && $0 ~ r1 { print $0 " matches " r1 } length(r1) && $0 ~ r2 { print $0 " matches " r2 }