ref: 14c3fe42d2a93be3a4ceb1946f8bb7fcaf75ac4d dir: /testdir/t.re1/
/[a-cg-j1-3]/ { print $0 " matches /[a-cg-j1-3]/" } /[^aeiou]/ { print $0 " matches /[^aeiou]/" }