ref: 0eeec2359f4cce389ae4e6163959c1fda3dcb9ad dir: /testdir/t.re1/
/[a-cg-j1-3]/ { print $0 " matches /[a-cg-j1-3]/" } /[^aeiou]/ { print $0 " matches /[^aeiou]/" }