func isDirectiveReplace(value string) bool {
	return value == replaceDirective
}

// userMetadataKeyPrefixes contains the prefixes of used-defined metadata keys.
// All values stored with a key starting with one of the following prefixes
// must be extracted from the header.
var userMetadataKeyPrefixes = []string{
	"x-amz-meta-",
	"x-minio-meta-",
}

			}
			if len(tc.excludedPrefixes) > 0 {
				var mismatch bool
				if len(v.ExcludedPrefixes) != len(tc.excludedPrefixes) {
					t.Fatalf("Test %d: Expected length of excluded prefixes %d but got %d", i+1, len(tc.excludedPrefixes), len(v.ExcludedPrefixes))
				}
				var i int
				var eprefix string
				for i, eprefix = range tc.excludedPrefixes {
					if eprefix != v.ExcludedPrefixes[i].Prefix {

			// With slash delimiter we only get the directory once.
			found := false
			if delimiter != slashSeparator {
				for _, p := range loi.Prefixes {
					if found {
						break
					}
					found = p == obj.Name
				}
			}
			if !found {
				loi.Prefixes = append(loi.Prefixes, obj.Name)
			}
		} else {
			loi.Objects = append(loi.Objects, obj)
		}
	}
	if loi.IsTruncated {

			t.Errorf("%s: Expected the number of objects in the result to be %d, but instead found %d", instanceType, 1, len(result.Objects))
		}
		if result.Prefixes[0] != "this/is/also/" {
			t.Errorf("%s: Expected prefix to be `%s`, but instead found `%s`", instanceType, "this/is/also/", result.Prefixes[0])
		}
	}

	// check delimited results with delimiter without prefix.
	{

	// IAM policies directory.
	iamConfigPoliciesPrefix = iamConfigPrefix + "/policies/"

	// IAM sts directory.
	iamConfigSTSPrefix = iamConfigPrefix + "/sts/"

	// IAM Policy DB prefixes.
	iamConfigPolicyDBPrefix                = iamConfigPrefix + "/policydb/"
	iamConfigPolicyDBUsersPrefix           = iamConfigPolicyDBPrefix + "users/"
	iamConfigPolicyDBSTSUsersPrefix        = iamConfigPolicyDBPrefix + "sts-users/"

		// Objects used: `objectNames[1-5]`.
		// UploadId's used: uploadIds[4-8].
		// (Test number 39).
		{bucketNames[2], "", "", "", "", 100, listMultipartResults[25], nil, true},
		// Test cases with prefixes.
		// Testing listing with prefix set to "min" (Test number 40)	.
		{bucketNames[2], "min", "", "", "", 100, listMultipartResults[26], nil, true},
		// Testing listing with prefix set to "ney" (Test number 41).

	// namespaced). As such, the regex has been relaxed to simply find the pod UID
	// followed by the container ID with allowances for arbitrary punctuation, and
	// container runtime prefixes, etc.
	regexp.MustCompile(`` +
		// "pod"-prefixed Pod UID (with punctuation separated groups) followed by punctuation

	},
	ErrOverlappingFilterNotification: {
		Code:           "InvalidArgument",
		Description:    "An object key name filtering rule defined with overlapping prefixes, overlapping suffixes, or overlapping combinations of prefixes and suffixes for the same event types.",
		HTTPStatusCode: http.StatusBadRequest,
	},
	ErrFilterNameInvalid: {
		Code:           "InvalidArgument",

			// Give up on IndexByte, it isn't skipping ahead
			// far enough to be better than Rabin-Karp.
			// Experiments (using IndexPeriodic) suggest
			// the cutover is about 16 byte skips.
			// TODO: if large prefixes of sep are matching
			// we should cutover at even larger average skips,
			// because Equal becomes that much more expensive.
			// This code does not take that effect into account.

	Suspended State = "Suspended"
)

var (
	errExcludedPrefixNotSupported = Errorf("excluded prefixes extension supported only when versioning is enabled")
	errTooManyExcludedPrefixes    = Errorf("too many excluded prefixes")
)

// ExcludedPrefix - holds individual prefixes excluded from being versioned.
type ExcludedPrefix struct {
	Prefix string
}

// Versioning - Configuration for bucket versioning.