package main
import (
"regexp"
"fmt"
)
func main() {
var re = regexp.MustCompile(`(?m)^(((\d{4}\/((0[13578]\/|1[02]\/)(0[1-9]|[12]\d|3[01])|(0[13456789]\/|1[012]\/)(0[1-9]|[12]\d|30)|02\/(0[1-9]|1\d|2[0-8])))|((([02468][048]|[13579][26])00|\d{2}([13579][26]|0[48]|[2468][048])))\/02\/29)){0,10}$`)
var str = `2016-02-29
2019/12/31
29/02/2016
^(?:(?:31(\/|-|\.)(?:0?[13578]|1[02]))\1|(?:(?:29|30)(\/|-|\.)(?:0?[1,3-9]|1[0-2])\2))(?:(?:1[6-9]|[2-9]\d)?\d{2})$|^(?:29(\/|-|\.)0?2\3(?:(?:(?:1[6-9]|[2-9]\d)?(?:0[48]|[2468][048]|[13579][26])|(?:(?:16|[2468][048]|[3579][26])00))))$|^(?:0?[1-9]|1\d|2[0-8])(\/|-|\.)(?:(?:0?[1-9])|(?:1[0-2]))\4(?:(?:1[6-9]|[2-9]\d)?\d{2})$
^(((\d{4}-((0[13578]-|1[02]-)(0[1-9]|[12]\d|3[01])|(0[13456789]-|1[012]-)(0[1-9]|[12]\d|30)|02-(0[1-9]|1\d|2[0-8])))|((([02468][048]|[13579][26])00|\d{2}([13579][26]|0[48]|[2468][048])))-02-29)){0,10}$`
for i, match := range re.FindAllString(str, -1) {
fmt.Println(match, "found at index", i)
}
}
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for Golang, please visit: https://golang.org/pkg/regexp/