Fix issue with backslashes when using pattern function

pattern/pattern.go

@@ -1,12 +1,19 @@
 package pattern
 
-import "path/filepath"
+import (
+	"path/filepath"
+	"strings"
+)
 
 // Match checks whether a string matches a pattern
 func Match(pattern, s string) bool {
 	if pattern == "*" {
 		return true
 	}
+	// Backslashes break filepath.Match, so we'll remove all of them.
+	// This has a pretty significant impact on performance when there
+	// are backslashes, but at least it doesn't break filepath.Match.
+	s = strings.ReplaceAll(s, "\\", "")
 	matched, _ := filepath.Match(pattern, s)
 	return matched
 }

pattern/pattern_bench_test.go

@@ -0,0 +1,21 @@
+package pattern
+
+import "testing"
+
+func BenchmarkMatch(b *testing.B) {
+	for n := 0; n < b.N; n++ {
+		if !Match("*ing*", "livingroom") {
+			b.Error("should've matched")
+		}
+	}
+	b.ReportAllocs()
+}
+
+func BenchmarkMatchWithBackslash(b *testing.B) {
+	for n := 0; n < b.N; n++ {
+		if !Match("*ing*", "living\\room") {
+			b.Error("should've matched")
+		}
+	}
+	b.ReportAllocs()
+}

pattern/pattern_test.go

@@ -1,6 +1,9 @@
 package pattern
 
-import "testing"
+import (
+	"fmt"
+	"testing"
+)
 
 func TestMatch(t *testing.T) {
 	testMatch(t, "*", "livingroom_123", true)
@@ -15,6 +18,7 @@ func TestMatch(t *testing.T) {
 	testMatch(t, "*vin*om*2*", "livingroom_123", true)
 	testMatch(t, "livingroom_123", "livingroom_123", true)
 	testMatch(t, "*livingroom_123*", "livingroom_123", true)
+	testMatch(t, "*test*", "\\test", true)
 	testMatch(t, "livingroom", "livingroom_123", false)
 	testMatch(t, "livingroom123", "livingroom_123", false)
 	testMatch(t, "what", "livingroom_123", false)
@@ -24,6 +28,7 @@ func TestMatch(t *testing.T) {
 }
 
 func testMatch(t *testing.T, pattern, key string, expectedToMatch bool) {
+	t.Run(fmt.Sprintf("pattern '%s' from '%s'", pattern, key), func(t *testing.T) {
 		matched := Match(pattern, key)
 		if expectedToMatch {
 			if !matched {
@@ -34,4 +39,5 @@ func testMatch(t *testing.T, pattern, key string, expectedToMatch bool) {
 				t.Errorf("%s shouldn't have matched pattern '%s'", key, pattern)
 			}
 		}
+	})
 }