b.ReportAllocs()
	for i := 0; i < b.N; i++ {
		subs := re.FindString(s)
		if subs != wantSubs {
			b.Fatalf("FindString(%q) = %q; want %q", s, subs, wantSubs)
		}
	}
}

func BenchmarkFindSubmatch(b *testing.B) {
	b.StopTimer()
	re := MustCompile("a(a+b+)b")
	wantSubs := "aaabb"
	s := []byte("acbb" + wantSubs + "dd")
	b.StartTimer()
	b.ReportAllocs()
	for i := 0; i < b.N; i++ {