[Fix rubocop#8664] Fix a false positive for `Naming/BinaryOperatorPar…

…ameterName`

Fixes rubocop#8664.

This PR fixes a false positive for `Naming/BinaryOperatorParameterName`
when naming multibyte character method name.

CHANGELOG.md

@@ -17,6 +17,7 @@
 * [#8655](https://github.com/rubocop-hq/rubocop/pull/8655): Fix a false positive for `Style/ClassAndModuleChildren` when using cbase class name. ([@koic][])
 * [#8654](https://github.com/rubocop-hq/rubocop/pull/8654): Fix a false positive for `Style/SafeNavigation` when checking `foo&.empty?` in a conditional. ([@koic][])
 * [#8660](https://github.com/rubocop-hq/rubocop/pull/8660): Fix a false positive for `Style/ClassAndModuleChildren` when using cbase module name. ([@koic][])
+* [#8664](https://github.com/rubocop-hq/rubocop/issues/8664): Fix a false positive for `Naming/BinaryOperatorParameterName` when naming multibyte character method name. ([@koic][])
 
 ### Changes
 

lib/rubocop/cop/naming/binary_operator_parameter_name.rb

@@ -35,7 +35,7 @@ def on_def(node)
         def op_method?(name)
           return false if EXCLUDED.include?(name)
 
-          !/\A\w/.match?(name) || OP_LIKE_METHODS.include?(name)
+          !/\A[[:word:]]/.match?(name) || OP_LIKE_METHODS.include?(name)
         end
       end
     end

spec/rubocop/cop/naming/binary_operator_parameter_name_spec.rb

@@ -81,6 +81,14 @@ def ===(string)
     RUBY
   end
 
+  it 'does not register an offense for multibyte character method name' do
+    expect_no_offenses(<<~RUBY)
+      def ｄｏ＿ｓｏｍｅｔｈｉｎｇ(string)
+        string
+      end
+    RUBY
+  end
+
   it 'does not register an offense for non binary operators' do
     expect_no_offenses(<<~RUBY)
       def -@; end