You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: filter.go
    path of file: ./repos/cockroach/pkg/cmd/roachtest/registry
    
    the code of the file until where you have to start completion: // Copyright 2021 The Cockroach Authors.
//
// Use of this software is governed by the Business Source License
// included in the file licenses/BSL.txt.
//
// As of the Change Date specified in that file, in accordance with
// the Business Source License, use of this software will be governed
// by the Apache License, Version 2.0, included in the file
// licenses/APL.txt.

package registry

import (
	"fmt"
	"regexp"
	"strings"

	"github.com/cockroachdb/errors"
)

// TestFilter holds the name and tag filters for filtering tests.
// See NewTestFilter.
type TestFilter struct {
	Name *regexp.Regexp

	// Cloud, if set, restricts the se
    
func (filter *TestFilter) MatchFailReasonString(r MatchFailReason) string {
	var reasons []string
	appendIf := func(b bool, format string, args ...interface{}) {
		if b {
			reasons = append(reasons, fmt.Sprintf(format, args...))
		}
	}
	appendIf(r.IsNotBenchmark, "is not a benchmark")
	appendIf(r.NameMismatch, "does not match regex %q", filter.Name)
	appendIf(r.OwnerMismatch, "does not have owner %q", filter.Owner)
	appendIf(r.NotPartOfSuite, "is not part of the %q suite", filter.Suite)
	appendIf(r.CloudNotCompatible, "is not compatible with %q", filter.Cloud)

	if len(reasons) <= 2 {
		// 0 reasons: ""
		// 1 reason:  "reason0"
		// 2 reasons: "reason0 and reason1"
		return strings.Join(reasons, " and ")
	}
	// 3 or more reasons: "reason0, reason1, reason2, and reason3
	return strings.Join(reasons[:len(reasons)-1], ", ") + ", and " + reasons[len(reasons)-1]
}