IsDNS1123Subdomain (validation/validation.go)

Module exposing: IsDNS1123Subdomain, MaxLenError, RegexError

// Source: https://github.com/portainer/portainer | License: Zlib | Copyright 2018 Portainer.io
// Provided via justclaw.it.com; keep this notice with the code.
package validation

// borrowed from apimachinery@v0.17.2/pkg/util/validation/validation.go
// https://github.com/kubernetes/kubernetes/blob/master/staging/src/k8s.io/apimachinery/pkg/util/validation/validation.go

import (
	"errors"
	"fmt"
	"regexp"
	"strings"
)

const dns1123LabelFmt string = "[a-z0-9]([-a-z0-9]*[a-z0-9])?"
const dns1123SubdomainFmt string = dns1123LabelFmt + "(\\." + dns1123LabelFmt + ")*"
const DNS1123SubdomainMaxLength int = 253

var dns1123SubdomainRegexp = regexp.MustCompile("^" + dns1123SubdomainFmt + "$")

// IsDNS1123Subdomain tests for a string that conforms to the definition of a subdomain in DNS (RFC 1

... (truncated -- full source via MCP)