diff --git a/weed/operation/upload_content.go b/weed/operation/upload_content.go
index 0d5cfd29c..934075ff3 100644
--- a/weed/operation/upload_content.go
+++ b/weed/operation/upload_content.go
@@ -63,7 +63,7 @@ func init() {
 	}}
 }
 
-var fileNameEscaper = strings.NewReplacer("\\", "\\\\", "\"", "\\\"")
+var fileNameEscaper = strings.NewReplacer(`\`, `\\`, `"`, `\"`)
 
 // Upload sends a POST request to a volume server to upload the content with adjustable compression level
 func UploadData(uploadUrl string, filename string, cipher bool, data []byte, isInputCompressed bool, mtype string, pairMap map[string]string, jwt security.EncodedJwt) (uploadResult *UploadResult, err error) {
diff --git a/weed/s3api/s3api_server.go b/weed/s3api/s3api_server.go
index 4993104ae..54df29492 100644
--- a/weed/s3api/s3api_server.go
+++ b/weed/s3api/s3api_server.go
@@ -64,7 +64,7 @@ func (s3a *S3ApiServer) registerRouter(router *mux.Router) {
 		bucket.Methods("HEAD").HandlerFunc(track(s3a.iam.Auth(s3a.HeadBucketHandler, ACTION_ADMIN), "GET"))
 
 		// CopyObjectPart
-		bucket.Methods("PUT").Path("/{object:.+}").HeadersRegexp("X-Amz-Copy-Source", ".*?(\\/|%2F).*?").HandlerFunc(track(s3a.iam.Auth(s3a.CopyObjectPartHandler, ACTION_WRITE), "PUT")).Queries("partNumber", "{partNumber:[0-9]+}", "uploadId", "{uploadId:.*}")
+		bucket.Methods("PUT").Path("/{object:.+}").HeadersRegexp("X-Amz-Copy-Source", `.*?(\/|%2F).*?`).HandlerFunc(track(s3a.iam.Auth(s3a.CopyObjectPartHandler, ACTION_WRITE), "PUT")).Queries("partNumber", "{partNumber:[0-9]+}", "uploadId", "{uploadId:.*}")
 		// PutObjectPart
 		bucket.Methods("PUT").Path("/{object:.+}").HandlerFunc(track(s3a.iam.Auth(s3a.PutObjectPartHandler, ACTION_WRITE), "PUT")).Queries("partNumber", "{partNumber:[0-9]+}", "uploadId", "{uploadId:.*}")
 		// CompleteMultipartUpload
diff --git a/weed/server/volume_server_handlers_read.go b/weed/server/volume_server_handlers_read.go
index 2a82fc1b1..2db46ac9b 100644
--- a/weed/server/volume_server_handlers_read.go
+++ b/weed/server/volume_server_handlers_read.go
@@ -23,7 +23,7 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/util"
 )
 
-var fileNameEscaper = strings.NewReplacer("\\", "\\\\", "\"", "\\\"")
+var fileNameEscaper = strings.NewReplacer(`\`, `\\`, `"`, `\"`)
 
 func (vs *VolumeServer) GetOrHeadHandler(w http.ResponseWriter, r *http.Request) {
 
diff --git a/weed/storage/disk_location_ec.go b/weed/storage/disk_location_ec.go
index 0ab45011c..91c7d86a6 100644
--- a/weed/storage/disk_location_ec.go
+++ b/weed/storage/disk_location_ec.go
@@ -14,7 +14,7 @@ import (
 )
 
 var (
-	re = regexp.MustCompile("\\.ec[0-9][0-9]")
+	re = regexp.MustCompile(`\.ec[0-9][0-9]`)
 )
 
 func (l *DiskLocation) FindEcVolume(vid needle.VolumeId) (*erasure_coding.EcVolume, bool) {