ref: 14c3fe42d2a93be3a4ceb1946f8bb7fcaf75ac4d dir: /testdir/t.re1a/
BEGIN { r1 = "[a-cg-j1-3]" r2 = "[^aeiou]" } $0 ~ r1 { print $0 " matches /[a-cg-j1-3]/" } $0 ~ r2 { print $0 " matches /[^aeiou]/" }