patterns

const (
	// See: https://github.com/distribution/reference/blob/v0.5.0/regexp.go#L53
	NameSeparator = `(?:[._]|__|[-]+)`

	// See: https://github.com/distribution/reference/blob/v0.5.0/regexp.go#L123
	PathComponent = Alphanumeric + `(` + NameSeparator + Alphanumeric + `)*`

	// See: https://github.com/distribution/reference/blob/v0.5.0/regexp.go#L125-L130
	ImageRepository = `(` + HostAndOptionalPort + `/)?` + PathComponent + `(/` + PathComponent + `)*`

	// See: https://github.com/distribution/reference/blob/v0.5.0/regexp.go#L68
	ImageTag = `[\w][\w.-]{0,127}`

	// See: https://github.com/distribution/reference/blob/v0.5.0/regexp.go#L81
	ImageDigest = `[A-Za-z][A-Za-z0-9]*(?:[-_+.][A-Za-z][A-Za-z0-9]*)*[:][0-9A-Fa-f]{32,}`

	// See: https://github.com/distribution/reference/blob/v0.5.0/regexp.go#L136C2-L136C14
	ImageReference = ImageRepository + `(:` + ImageTag + `)?` + `(@` + ImageDigest + `)?`
)

const (
	// See: https://github.com/kubernetes/apimachinery/blob/v0.28.1/pkg/util/validation/validation.go#L178
	DNS1123Label = `[a-z0-9]([-a-z0-9]*[a-z0-9])?`

	// See: https://github.com/kubernetes/apimachinery/blob/v0.28.1/pkg/util/validation/validation.go#L205
	DNS1123Subdomain = DNS1123Label + `(\.` + DNS1123Label + `)*`
)

const (
	// See: https://github.com/distribution/reference/blob/v0.5.0/regexp.go#L91
	IPv6 = `\[(?:[a-fA-F0-9:]+)\]`

	Port = `:[0-9]+`

	// See https://github.com/distribution/reference/blob/v0.5.0/regexp.go#L65
	OptionalPort = `(` + Port + `)?`

	// See: https://github.com/distribution/reference/blob/v0.5.0/regexp.go#L106
	Host = `(?:` + DNS1123Subdomain + `|` + IPv6 + `)`

	// See: https://github.com/distribution/reference/blob/v0.5.0/regexp.go#L110
	HostAndOptionalPort = Host + OptionalPort
)

const (
	// See: https://github.com/distribution/reference/blob/v0.5.0/regexp.go#L44C2-L44C28
	Alphanumeric = `[a-z0-9]+`
)