Relax the version checking for Arch packages (#32908)

It is mentioned in https://man.archlinux.org/man/PKGBUILD.5: 'The
variable is not allowed to contain colons, forward slashes, hyphens, or
whitespace.'

`_` is also an allowed character, and some software in the Arch Linux
AUR uses this naming convention.

---------

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

modules/packages/arch/metadata.go

@@ -44,7 +44,8 @@ var (
 
 	// https://man.archlinux.org/man/PKGBUILD.5
 	namePattern = regexp.MustCompile(`\A[a-zA-Z0-9@._+-]+\z`)
-	versionPattern = regexp.MustCompile(`\A(?:[0-9]:)?[a-zA-Z0-9.+~]+(?:-[a-zA-Z0-9.+-~]+)?\z`)
+	// (epoch:pkgver-pkgrel)
+	versionPattern = regexp.MustCompile(`\A(?:\d:)?[\w.+~]+(?:-[-\w.+~]+)?\z`)
 )
 
 type Package struct {

modules/packages/arch/metadata_test.go

@@ -122,6 +122,14 @@ func TestParsePackageInfo(t *testing.T) {
 		assert.ErrorIs(t, err, ErrInvalidName)
 	})
 
+	t.Run("Regexp", func(t *testing.T) {
+		assert.Regexp(t, versionPattern, "1.2_3~4+5")
+		assert.Regexp(t, versionPattern, "1:2_3~4+5")
+		assert.NotRegexp(t, versionPattern, "a:1.0.0-1")
+		assert.NotRegexp(t, versionPattern, "0.0.1/1-1")
+		assert.NotRegexp(t, versionPattern, "1.0.0 -1")
+	})
+
 	t.Run("InvalidVersion", func(t *testing.T) {
 		data := createPKGINFOContent(packageName, "")