ref: c3eea8755d4adbf3dc4cb9bda166a9e02c2064b5 dir: /test/t.re1/
/[a-cg-j1-3]/ { print $0 " matches /[a-cg-j1-3]/" } /[^aeiou]/ { print $0 " matches /[^aeiou]/" }