diff --git a/lib/mutant/cli/classifier.rb b/lib/mutant/cli/classifier.rb
index f7749758..8bbaf6e9 100644
--- a/lib/mutant/cli/classifier.rb
+++ b/lib/mutant/cli/classifier.rb
@@ -8,8 +8,10 @@ module Mutant
 
       SCOPE_NAME_PATTERN  = /[A-Za-z][A-Za-z_0-9]*/.freeze
       OPERATOR_PATTERN    = Regexp.union(*OPERATOR_METHODS.map(&:to_s)).freeze
-      METHOD_NAME_PATTERN = /([_A-Za-z][A-Za-z0-9_]*[!?=]?|#{OPERATOR_PATTERN})/.freeze
-      SCOPE_PATTERN       = /(?:::)?#{SCOPE_NAME_PATTERN}(?:::#{SCOPE_NAME_PATTERN})*/.freeze
+      METHOD_NAME_PATTERN =
+        /([_A-Za-z][A-Za-z0-9_]*[!?=]?|#{OPERATOR_PATTERN})/.freeze
+      SCOPE_PATTERN =
+        /(?:::)?#{SCOPE_NAME_PATTERN}(?:::#{SCOPE_NAME_PATTERN})*/.freeze
       CBASE_PATTERN       = /\A::/.freeze
       SCOPE_OPERATOR      = '::'.freeze
       SINGLETON_PATTERN   = /\A(#{SCOPE_PATTERN})\z/.freeze
@@ -36,9 +38,12 @@ module Mutant
       # @api private
       #
       def self.constant_lookup(location)
-        location.gsub(CBASE_PATTERN, EMPTY_STRING).split(SCOPE_OPERATOR).reduce(Object) do |parent, name|
-          parent.const_get(name)
-        end
+        location
+          .gsub(CBASE_PATTERN, EMPTY_STRING)
+          .split(SCOPE_OPERATOR)
+          .reduce(Object) do |parent, name|
+            parent.const_get(name)
+          end
       end
 
       # Return matchers for input
diff --git a/lib/mutant/cli/classifier/method.rb b/lib/mutant/cli/classifier/method.rb
index ff1df8bd..c4353a0e 100644
--- a/lib/mutant/cli/classifier/method.rb
+++ b/lib/mutant/cli/classifier/method.rb
@@ -10,7 +10,8 @@ module Mutant
           '#' => Matcher::Methods::Instance
         }.freeze
 
-        REGEXP = /\A(#{SCOPE_PATTERN})([.#])(#{METHOD_NAME_PATTERN}\z)/.freeze
+        REGEXP =
+          %r(\A(#{SCOPE_PATTERN})([.#])(#{METHOD_NAME_PATTERN}\z)).freeze
 
         # Positions of captured regexp groups
         SCOPE_NAME_POSITION   = 1