store: move regex to where it's used

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

store/store.go

@@ -4,7 +4,6 @@ import (
 	"encoding/json"
 	"os"
 	"path/filepath"
-	"regexp"
 	"sort"
 
 	"github.com/docker/docker/pkg/ioutils"
@@ -199,8 +198,6 @@ type current struct {
 	Global bool
 }
 
-var namePattern = regexp.MustCompile(`^[a-zA-Z][a-zA-Z0-9\.\-_]*$`)
-
 func toHash(in string) string {
 	return digest.FromBytes([]byte(in)).Hex()[:20]
 }

store/util.go

@@ -2,12 +2,15 @@ package store
 
 import (
 	"os"
+	"regexp"
 	"strings"
 
 	"github.com/docker/docker/pkg/namesgenerator"
 	"github.com/pkg/errors"
 )
 
+var namePattern = regexp.MustCompile(`^[a-zA-Z][a-zA-Z0-9\.\-_]*$`)
+
 func ValidateName(s string) (string, error) {
 	if !namePattern.MatchString(s) {
 		return "", errors.Errorf("invalid name %s, name needs to start with a letter and may not contain symbols, except ._-", s)