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golangにおけるDateバリデーションヅラ

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その1. regexpによる正規表現を使ったバリデーション

reg.go
validater := regexp.MustCompile(`\d{4}(/\d{2}){2} \d{2}(:\d{2}){2}`)
fmt.Println(validater.MatchString("2012/12/10 12:30:45"))
// true

fmt.Println(validater.MatchString("Mon, 02 Jan 2012 12:30:45"))
// false

その2. timeによる文字列一致を使ったバリデーション

time.go
layout := "2006/01/02 15:04:05"
_, err := time.Parse(layout, "2012/12/10 12:30:45")
// err == nil にてokを確認

layoutの指定方式は magical date magical reference date を参照。
 他言語と指定形式が異なるため注意が必要ヅラ(YYYY/MM/DD等でなく指定の実値にて設定)

互いのBenchmark比較

validation_test.go
func BenchmarkRegexpPack(b *testing.B) {
	validater := regexp.MustCompile(`\d{4}(/\d{2}){2} \d{2}(:\d{2}){2}`)
	b.ResetTimer()
	for i := 0; i < b.N; i++ {
		validater.MatchString("2012/12/10 12:30:45")
	}
}

func BenchmarkTimePack(b *testing.B) {
	layout := "2006/01/02 15:04:05"
	b.ResetTimer()
	for i := 0; i < b.N; i++ {
		time.Parse(layout, "2012/12/10 12:30:45")
	}
}

// > $ go test -bench . -benchmem -benchtime 3s
// BenchmarkRegexpPack-12    20000000    286 ns/op    0 B/op    0 allocs/op
// BenchmarkTimePack-12      30000000    145 ns/op    0 B/op    0 allocs/op
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