Goで正規表現を使用してJSON日付を解析するにはどうすればよいですか?

/^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2})(\.\d+)?Z$/

package main

import (
    "fmt"
    "regexp"
)

func main() {
    date := "2023-07-04T13:30:00.123Z"

    matched, err := regexp.MatchString(`^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2})(\.\d+)?Z$`, date)
    if err != nil {
        fmt.Println("Error:", err)
        return
    }

    if matched {
        fmt.Println("Date parsed successfully")
    } else {
        fmt.Println("Invalid date format")
    }
}

{
  "dates": [
    "2023-07-04T13:30:00.123Z",
    "2023-07-05T10:00:00Z",
    "2023-07-06T15:15:00Z"
  ]
}

package main

import (
    "encoding/json"
    "fmt"
    "io/ioutil"
    "log"
    "regexp"
)

func main() {
    data, err := ioutil.ReadFile("dates.json")
    if err != nil {
        log.Fatal(err)
    }

    type DateResponse struct {
        Dates []string `json:"dates"`
    }

    var datesResponse DateResponse
    if err := json.Unmarshal(data, &datesResponse); err != nil {
        log.Fatal(err)
    }

    for _, date := range datesResponse.Dates {
        matched, err := regexp.MatchString(`^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2})(\.\d+)?Z$`, date)
        if err != nil {
            fmt.Println("Error:", err)
        }

        if matched {
            fmt.Println("Date parsed successfully")
        } else {
            fmt.Println("Invalid date format:", date)
        }
    }
}