testdir/t.re1 - platform/external/one-true-awk - Git at Google

 /[a-cg-j1-3]/	{ print $0 " matches /[a-cg-j1-3]/" }
 /[^aeiou]/	{ print $0 " matches /[^aeiou]/" }
	/[a-cg-j1-3]/ { print $0 " matches /[a-cg-j1-3]/" }
	/[^aeiou]/ { print $0 " matches /[^aeiou]/" }