diff --git a/Library/Homebrew/locale.rb b/Library/Homebrew/locale.rb
index eefbc464f8..40647ea62c 100644
--- a/Library/Homebrew/locale.rb
+++ b/Library/Homebrew/locale.rb
@@ -47,12 +47,12 @@ class Locale
       return if (sep && scanner.eos?) || (sep.nil? && !scanner.eos?)
     end
 
-    if (region = scanner.scan(REGION_REGEX))
+    if (script = scanner.scan(SCRIPT_REGEX))
       sep = scanner.scan(/-/)
       return if (sep && scanner.eos?) || (sep.nil? && !scanner.eos?)
     end
 
-    script = scanner.scan(SCRIPT_REGEX)
+    region = scanner.scan(REGION_REGEX)
 
     return unless scanner.eos?
 
diff --git a/Library/Homebrew/test/locale_spec.rb b/Library/Homebrew/test/locale_spec.rb
index e704fe87b0..8cd7d9938d 100644
--- a/Library/Homebrew/test/locale_spec.rb
+++ b/Library/Homebrew/test/locale_spec.rb
@@ -9,7 +9,7 @@ describe Locale do
       expect(described_class.parse("zh")).to eql(described_class.new("zh", nil, nil))
       expect(described_class.parse("zh-CN")).to eql(described_class.new("zh", "CN", nil))
       expect(described_class.parse("zh-Hans")).to eql(described_class.new("zh", nil, "Hans"))
-      expect(described_class.parse("zh-CN-Hans")).to eql(described_class.new("zh", "CN", "Hans"))
+      expect(described_class.parse("zh-Hans-CN")).to eql(described_class.new("zh", "CN", "Hans"))
     end
 
     it "correctly parses a string with a UN M.49 region code" do
@@ -22,6 +22,7 @@ describe Locale do
       end
 
       it "a string in a wrong format" do
+        expect { described_class.parse("zh-CN-Hans") }.to raise_error(Locale::ParserError)
         expect { described_class.parse("zh_CN_Hans") }.to raise_error(Locale::ParserError)
         expect { described_class.parse("zhCNHans") }.to raise_error(Locale::ParserError)
         expect { described_class.parse("zh-CN_Hans") }.to raise_error(Locale::ParserError)
@@ -54,14 +55,14 @@ describe Locale do
     it { is_expected.to include("CN") }
     it { is_expected.to include("CN-Hans") }
     it { is_expected.to include("Hans") }
-    it { is_expected.to include("zh-CN-Hans") }
+    it { is_expected.to include("zh-Hans-CN") }
   end
 
   describe "#eql?" do
     subject(:locale) { described_class.new("zh", "CN", "Hans") }
 
     context "when all parts match" do
-      it { is_expected.to eql("zh-CN-Hans") }
+      it { is_expected.to eql("zh-Hans-CN") }
       it { is_expected.to eql(locale) }
     end
 
@@ -69,7 +70,7 @@ describe Locale do
       it { is_expected.not_to eql("zh") }
       it { is_expected.not_to eql("zh-CN") }
       it { is_expected.not_to eql("CN") }
-      it { is_expected.not_to eql("CN-Hans") }
+      it { is_expected.not_to eql("Hans-CN") }
       it { is_expected.not_to eql("Hans") }
     end