ref: c0f4e97e4561ff42544e92512bbaf3d7d1f6a671 dir: /testdir/t.re3/
{ r1 = $1 r2 = $1 ":" } length(r1) && $0 ~ r1 { print $0 " matches " r1 } length(r1) && $0 ~ r2 { print $0 " matches " r2 }