ref: 279f78a86cbff3f526fe1a1debd4d4f5766f96b0 dir: /test/t.re1/
/[a-cg-j1-3]/ { print $0 " matches /[a-cg-j1-3]/" } /[^aeiou]/ { print $0 " matches /[^aeiou]/" }