fix: remove redundant character escape '\/'

pkg/fsutils/path_unix.go

@@ -0,0 +1,8 @@
+//go:build !windows
+
+package fsutils
+
+// NormalizePathInRegex it's a noop function on Unix.
+func NormalizePathInRegex(path string) string {
+	return path
+}

pkg/fsutils/path_windows.go

@@ -0,0 +1,28 @@
+//go:build windows
+
+package fsutils
+
+import (
+	"path/filepath"
+	"regexp"
+	"strings"
+)
+
+var separatorToReplace = regexp.QuoteMeta(string(filepath.Separator))
+
+// NormalizePathInRegex normalizes path in regular expressions.
+// noop on Unix.
+// This replacing should be safe because "/" are disallowed in Windows
+// https://docs.microsoft.com/windows/win32/fileio/naming-a-file
+func NormalizePathInRegex(path string) string {
+	// remove redundant character escape "\/" https://github.com/golangci/golangci-lint/issues/3277
+	clean := regexp.MustCompile(`\\+/`).
+		ReplaceAllStringFunc(path, func(s string) string {
+			if strings.Count(s, "\\")%2 == 0 {
+				return s
+			}
+			return s[1:]
+		})
+
+	return strings.ReplaceAll(clean, "/", separatorToReplace)
+}

pkg/golinters/depguard.go

@@ -2,8 +2,6 @@ package golinters
 
 import (
 	"fmt"
-	"path/filepath"
-	"regexp"
 	"strings"
 	"sync"
 
@@ -12,6 +10,7 @@ import (
 	"golang.org/x/tools/go/loader" //nolint:staticcheck // require changes in github.com/OpenPeeDeeP/depguard
 
 	"github.com/golangci/golangci-lint/pkg/config"
+	"github.com/golangci/golangci-lint/pkg/fsutils"
 	"github.com/golangci/golangci-lint/pkg/golinters/goanalysis"
 	"github.com/golangci/golangci-lint/pkg/lint/linter"
 	"github.com/golangci/golangci-lint/pkg/result"
@@ -106,16 +105,6 @@ func (d depGuard) run(pass *analysis.Pass) ([]goanalysis.Issue, error) {
 	return resIssues, nil
 }
 
-var separatorToReplace = regexp.QuoteMeta(string(filepath.Separator))
-
-// normalizePathInRegex normalizes path in regular expressions.
-// noop on Unix.
-// This replacing should be safe because "/" are disallowed in Windows
-// https://docs.microsoft.com/windows/win32/fileio/naming-a-file
-func normalizePathInRegex(path string) string {
-	return strings.ReplaceAll(path, "/", separatorToReplace)
-}
-
 type guardian struct {
 	*depguard.Depguard
 	pkgsWithErrorMessage map[string]string
@@ -124,7 +113,7 @@ type guardian struct {
 func newGuardian(settings *config.DepGuardSettings) (*guardian, error) {
 	var ignoreFileRules []string
 	for _, rule := range settings.IgnoreFileRules {
-		ignoreFileRules = append(ignoreFileRules, normalizePathInRegex(rule))
+		ignoreFileRules = append(ignoreFileRules, fsutils.NormalizePathInRegex(rule))
 	}
 
 	dg := &depguard.Depguard{

pkg/result/processors/exclude_rules.go

@@ -44,7 +44,7 @@ func createRules(rules []ExcludeRule, prefix string) []excludeRule {
 			parsedRule.source = regexp.MustCompile(prefix + rule.Source)
 		}
 		if rule.Path != "" {
-			path := normalizePathInRegex(rule.Path)
+			path := fsutils.NormalizePathInRegex(rule.Path)
 			parsedRule.path = regexp.MustCompile(path)
 		}
 		parsedRules = append(parsedRules, parsedRule)

pkg/result/processors/severity_rules.go

@@ -49,7 +49,7 @@ func createSeverityRules(rules []SeverityRule, prefix string) []severityRule {
 			parsedRule.source = regexp.MustCompile(prefix + rule.Source)
 		}
 		if rule.Path != "" {
-			path := normalizePathInRegex(rule.Path)
+			path := fsutils.NormalizePathInRegex(rule.Path)
 			parsedRule.path = regexp.MustCompile(path)
 		}
 		parsedRules = append(parsedRules, parsedRule)

pkg/result/processors/skip_dirs.go

@@ -7,6 +7,7 @@ import (
 
 	"github.com/pkg/errors"
 
+	"github.com/golangci/golangci-lint/pkg/fsutils"
 	"github.com/golangci/golangci-lint/pkg/logutils"
 	"github.com/golangci/golangci-lint/pkg/result"
 )
@@ -31,7 +32,7 @@ const goFileSuffix = ".go"
 func NewSkipDirs(patterns []string, log logutils.Log, runArgs []string) (*SkipDirs, error) {
 	var patternsRe []*regexp.Regexp
 	for _, p := range patterns {
-		p = normalizePathInRegex(p)
+		p = fsutils.NormalizePathInRegex(p)
 		patternRe, err := regexp.Compile(p)
 		if err != nil {
 			return nil, errors.Wrapf(err, "can't compile regexp %q", p)

pkg/result/processors/skip_files.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"regexp"
 
+	"github.com/golangci/golangci-lint/pkg/fsutils"
 	"github.com/golangci/golangci-lint/pkg/result"
 )
 
@@ -16,7 +17,7 @@ var _ Processor = (*SkipFiles)(nil)
 func NewSkipFiles(patterns []string) (*SkipFiles, error) {
 	var patternsRe []*regexp.Regexp
 	for _, p := range patterns {
-		p = normalizePathInRegex(p)
+		p = fsutils.NormalizePathInRegex(p)
 		patternRe, err := regexp.Compile(p)
 		if err != nil {
 			return nil, fmt.Errorf("can't compile regexp %q: %s", p, err)

test/testshared/runner.go

@@ -14,6 +14,7 @@ import (
 	"github.com/stretchr/testify/require"
 
 	"github.com/golangci/golangci-lint/pkg/exitcodes"
+	"github.com/golangci/golangci-lint/pkg/fsutils"
 	"github.com/golangci/golangci-lint/pkg/logutils"
 )
 
@@ -304,7 +305,7 @@ func (r *RunnerResult) ExpectExitCode(possibleCodes ...int) *RunnerResult {
 func (r *RunnerResult) ExpectOutputRegexp(s string) *RunnerResult {
 	r.tb.Helper()
 
-	assert.Regexp(r.tb, normalizePathInRegex(s), r.output, "exit code is %d", r.exitCode)
+	assert.Regexp(r.tb, fsutils.NormalizePathInRegex(s), r.output, "exit code is %d", r.exitCode)
 	return r
 }
 

test/testshared/runner_unix.go

@@ -29,8 +29,3 @@ func defaultBinaryName() string {
 func normalizeFilePath(in string) string {
 	return in
 }
-
-// normalizePathInRegex it's a noop function on Unix.
-func normalizePathInRegex(path string) string {
-	return path
-}

test/testshared/runner_windows.go

@@ -41,11 +41,3 @@ func normalizeFilePath(in string) string {
 		return strings.ReplaceAll(s, "/", "\\")
 	})
 }
-
-// normalizePathInRegex normalizes path in regular expressions.
-// Replace all `/` with `\\`.
-// This replacing should be safe because "/" are disallowed in Windows
-// https://docs.microsoft.com/windows/win32/fileio/naming-a-file
-func normalizePathInRegex(path string) string {
-	return strings.ReplaceAll(path, "/", regexp.QuoteMeta(string(filepath.Separator)))
-}