ref: 8e3c92b4eae6ff958d8af946caf6fb7d7f3bfbf7 dir: /test/t.re1/
/[a-cg-j1-3]/ { print $0 " matches /[a-cg-j1-3]/" } /[^aeiou]/ { print $0 " matches /[^aeiou]/" }