ref: ba4a1c07f1bc7622f8a3dcd4f2d383f4ec70fc1c dir: /test/t.re1/
/[a-cg-j1-3]/ { print $0 " matches /[a-cg-j1-3]/" } /[^aeiou]/ { print $0 " matches /[^aeiou]/" }