all-container-registry: $(addprefix sub-container-registry-,$(ALL_OS_ARCH))

# split words on hyphen, access by 1-index
word-hyphen = $(word $2,$(subst -, ,$1))
sub-container-%:
	$(MAKE) OUTPUT_TYPE=$(call word-hyphen,$*,1) OS=$(call word-hyphen,$*,2) ARCH=$(call word-hyphen,$*,3) OSVERSION=$(call word-hyphen,$*,4) container

build: $(foreach binary, ${BIN}, bin/${binary}-${OS}-${ARCH})

[
  {
    "comment": "Label with hyphens in 3rd and 4th position",
    "input": "aa--",
    "output": "aa--"
  },
  {
    "input": "a†--",
    "output": "xn--a---kp0a"
  },
  {
    "input": "ab--c",
    "output": "ab--c"
  },
  {
    "comment": "Label with leading hyphen",
    "input": "-x",
    "output": "-x"
  },
  {
    "input": "-†",
    "output": "xn----xhn"
  },
  {
    "input": "-x.xn--zca",

Most of the standard headers are separated by a "hyphen" character, also known as the "minus symbol" (`-`).

But a variable like `user-agent` is invalid in Python.

So, by default, `Header` will convert the parameter names characters from underscore (`_`) to hyphen (`-`) to extract and document the headers.

		case "kubernetes.io/h2c":
			return protocol.HTTP2
		}
	}

	// Check if the port name prefix is "grpc-web". Need to do this before the general
	// prefix check below, since it contains a hyphen.
	if len(name) >= grpcWebLen && strings.EqualFold(name[:grpcWebLen], grpcWeb) {
		return protocol.GRPCWeb
	}

	// Parse the port name to find the prefix, if any.
	i := strings.IndexByte(name, '-')
	if i >= 0 {

and test another isolated pipeline from any branch. 

We'll explain everything via an example. Let's say you make some changes on your branch `myTestBranch`
(we highly recommend to name this branch without prefix and hyphen (`-`) because it's used to generate build type ID) and want to
test these changes without affecting `master`/`release` pipeline. Here are the instructions.

// 1. naming should be consistent across the controllers
// 2. use of shortcuts should be avoided, unless they are well-known non-Kubernetes shortcuts
// 3. Kubernetes' resources should be written together without a hyphen ("-")
//
// CHANGE POLICY
// The controller names should be treated as IDs.

	// character is a dot.
	l := len(s)
	if l == 0 || l > 254 || l == 254 && s[l-1] != '.' {
		return false
	}

	last := byte('.')
	nonNumeric := false // true once we've seen a letter or hyphen
	partlen := 0
	for i := 0; i < len(s); i++ {
		c := s[i]
		switch {
		default:
			return false
		case 'a' <= c && c <= 'z' || 'A' <= c && c <= 'Z' || c == '_':
			nonNumeric = true
			partlen++

    /** PARALLEL TO */
    public static final char PARALLEL_TO = '\u2225';

    /** MINUS SIGN */
    public static final char MINUS_SIGN = '\u2212';

    /** FULLWIDTH HYPHEN-MINUS */
    public static final char FULLWIDTH_HYPHEN_MINUS = '\uFF0D';

    /** CENT SIGN */
    public static final char CENT_SIGN = '\u00A2';

    /** FULLWIDTH CENT SIGN */

		}
	}
	headerSorterPool.Put(sorter)
	return nil
}

// CanonicalHeaderKey returns the canonical format of the
// header key s. The canonicalization converts the first
// letter and any letter following a hyphen to upper case;
// the rest are converted to lowercase. For example, the
// canonical key for "accept-encoding" is "Accept-Encoding".
// If s contains a space or invalid header field bytes, it is

	addCadvisorFlags(fs)
	addCredentialProviderFlags(fs)
	verflag.AddFlags(fs)
	logs.AddFlags(fs, logs.SkipLoggingConfigurationFlags())
}

// normalize replaces underscores with hyphens
// we should always use hyphens instead of underscores when registering kubelet flags
func normalize(s string) string {
	return strings.Replace(s, "_", "-", -1)
}