kubernetes/staging/src/k8s.io/apimachinery/pkg/util/net/port_split.go

var validSchemes …

// SplitSchemeNamePort takes a string of the following forms:
//   - "<name>",                 returns "",        "<name>","",      true
//   - "<name>:<port>",          returns "",        "<name>","<port>",true
//   - "<scheme>:<name>:<port>", returns "<scheme>","<name>","<port>",true
//
// Name must be non-empty or valid will be returned false.
// Scheme must be "http" or "https" if specified
// Port is returned as a string, and it is not required to be numeric (could be
// used for a named port, for example).
func SplitSchemeNamePort(id string) (scheme, name, port string, valid bool) { … }

// JoinSchemeNamePort returns a string that specifies the scheme, name, and port:
//   - "<name>"
//   - "<name>:<port>"
//   - "<scheme>:<name>:<port>"
//
// None of the parameters may contain a ':' character
// Name is required
// Scheme must be "", "http", or "https"
func JoinSchemeNamePort(scheme, name, port string) string { … }