diff --git a/Library/Homebrew/cask/cmd/abstract_command.rb b/Library/Homebrew/cask/cmd/abstract_command.rb
index 6690ae55a3..23e972087c 100644
--- a/Library/Homebrew/cask/cmd/abstract_command.rb
+++ b/Library/Homebrew/cask/cmd/abstract_command.rb
@@ -12,8 +12,6 @@ module Cask
       extend T::Sig
       extend T::Helpers
 
-      include Homebrew::Search
-
       OPTIONS = [
         [:switch, "--[no-]binaries", {
           description: "Disable/enable linking of helper executables (default: enabled).",
@@ -87,7 +85,7 @@ module Cask
       end
 
       def suggestion_message(cask_token)
-        matches = search_casks(cask_token)
+        matches = Homebrew::Search.search_casks(cask_token)
 
         if matches.one?
           "Did you mean '#{matches.first}'?"
diff --git a/Library/Homebrew/cmd/desc.rb b/Library/Homebrew/cmd/desc.rb
index 46fff56915..b38a8ae11f 100644
--- a/Library/Homebrew/cmd/desc.rb
+++ b/Library/Homebrew/cmd/desc.rb
@@ -11,8 +11,6 @@ module Homebrew
 
   module_function
 
-  extend Search
-
   sig { returns(CLI::Parser) }
   def desc_args
     Homebrew::CLI::Parser.new do
@@ -71,23 +69,8 @@ module Homebrew
       Descriptions.new(desc).print
     else
       query = args.named.join(" ")
-      string_or_regex = query_regexp(query)
-      eval_all = args.eval_all? || Homebrew::EnvConfig.eval_all?
-      unless args.cask?
-        ohai "Formulae"
-        CacheStoreDatabase.use(:descriptions) do |db|
-          cache_store = DescriptionCacheStore.new(db)
-          Descriptions.search(string_or_regex, search_type, cache_store, eval_all).print
-        end
-      end
-      unless args.formula?
-        puts unless args.cask?
-        ohai "Casks"
-        CacheStoreDatabase.use(:cask_descriptions) do |db|
-          cache_store = CaskDescriptionCacheStore.new(db)
-          Descriptions.search(string_or_regex, search_type, cache_store, eval_all).print
-        end
-      end
+      string_or_regex = Search.query_regexp(query)
+      Search.search_descriptions(string_or_regex, args, search_type: search_type)
     end
   end
 end
diff --git a/Library/Homebrew/cmd/install.rb b/Library/Homebrew/cmd/install.rb
index 8dc6251c46..8a67db1249 100644
--- a/Library/Homebrew/cmd/install.rb
+++ b/Library/Homebrew/cmd/install.rb
@@ -8,7 +8,6 @@ require "missing_formula"
 require "formula_installer"
 require "development_tools"
 require "install"
-require "search"
 require "cleanup"
 require "cli/parser"
 require "upgrade"
@@ -16,8 +15,6 @@ require "upgrade"
 module Homebrew
   extend T::Sig
 
-  extend Search
-
   module_function
 
   sig { returns(CLI::Parser) }
@@ -299,11 +296,12 @@ module Homebrew
     # so we might as well return early.
     return if name.include?("/")
 
+    require "search"
     ohai "Searching for similarly named formulae and casks..."
 
     # Don't treat formula/cask name as a regex
     query = string_or_regex = name
-    all_formulae, all_casks = search_names(query, string_or_regex, args)
+    all_formulae, all_casks = Search.search_names(query, string_or_regex, args)
 
     if all_formulae.any?
       ohai "Formulae", Formatter.columns(all_formulae)
diff --git a/Library/Homebrew/cmd/search.rb b/Library/Homebrew/cmd/search.rb
index bc0e6d01b1..ba56e35d74 100644
--- a/Library/Homebrew/cmd/search.rb
+++ b/Library/Homebrew/cmd/search.rb
@@ -12,8 +12,6 @@ module Homebrew
 
   module_function
 
-  extend Search
-
   PACKAGE_MANAGERS = {
     repology:  ->(query) { "https://repology.org/projects/?search=#{query}" },
     macports:  ->(query) { "https://ports.macports.org/search/?q=#{query}" },
@@ -76,17 +74,17 @@ module Homebrew
     return if search_package_manager(args)
 
     query = args.named.join(" ")
-    string_or_regex = query_regexp(query)
+    string_or_regex = Search.query_regexp(query)
 
     if args.desc?
       if !args.eval_all? && !Homebrew::EnvConfig.eval_all?
         odeprecated "brew search --desc", "brew search --desc --eval-all or HOMEBREW_EVAL_ALL"
       end
-      search_descriptions(string_or_regex, args)
+      Search.search_descriptions(string_or_regex, args)
     elsif args.pull_request?
       search_pull_requests(query, args)
     else
-      formulae, casks = search_names(query, string_or_regex, args)
+      formulae, casks = Search.search_names(query, string_or_regex, args)
       print_results(formulae, casks, query)
     end
 
diff --git a/Library/Homebrew/descriptions.rb b/Library/Homebrew/descriptions.rb
index 9382bc2107..ff252b5798 100644
--- a/Library/Homebrew/descriptions.rb
+++ b/Library/Homebrew/descriptions.rb
@@ -3,15 +3,12 @@
 
 require "formula"
 require "formula_versions"
-require "search"
 require "searchable"
 
 # Helper class for printing and searching descriptions.
 #
 # @api private
 class Descriptions
-  extend Homebrew::Search
-
   # Given a regex, find all formulae whose specified fields contain a match.
   def self.search(string_or_regex, field, cache_store, eval_all = Homebrew::EnvConfig.eval_all?)
     cache_store.populate_if_empty!(eval_all: eval_all)
diff --git a/Library/Homebrew/extend/os/mac/search.rb b/Library/Homebrew/extend/os/mac/search.rb
deleted file mode 100644
index 5901ac74ba..0000000000
--- a/Library/Homebrew/extend/os/mac/search.rb
+++ /dev/null
@@ -1,56 +0,0 @@
-# typed: false
-# frozen_string_literal: true
-
-require "cask/cask"
-require "cask/cask_loader"
-
-module Homebrew
-  module Search
-    module Extension
-      def search_descriptions(string_or_regex, args)
-        super
-
-        return if args.formula?
-
-        puts unless args.cask?
-        ohai "Casks"
-        CacheStoreDatabase.use(:cask_descriptions) do |db|
-          cache_store = CaskDescriptionCacheStore.new(db)
-          eval_all = args.eval_all? || Homebrew::EnvConfig.eval_all?
-          Descriptions.search(string_or_regex, :desc, cache_store, eval_all).print
-        end
-      end
-
-      def search_casks(string_or_regex)
-        if string_or_regex.is_a?(String) && string_or_regex.match?(HOMEBREW_TAP_CASK_REGEX)
-          return begin
-            [Cask::CaskLoader.load(string_or_regex).token]
-          rescue Cask::CaskUnavailableError
-            []
-          end
-        end
-
-        cask_tokens = Tap.flat_map(&:cask_tokens).map do |c|
-          c.sub(%r{^homebrew/cask.*/}, "")
-        end
-
-        results = cask_tokens.extend(Searchable)
-                             .search(string_or_regex)
-
-        results += DidYouMean::SpellChecker.new(dictionary: cask_tokens)
-                                           .correct(string_or_regex)
-
-        results.sort.map do |name|
-          cask = Cask::CaskLoader.load(name)
-          if cask.installed?
-            pretty_installed(cask.full_name)
-          else
-            cask.full_name
-          end
-        end.uniq
-      end
-    end
-
-    prepend Extension
-  end
-end
diff --git a/Library/Homebrew/extend/os/search.rb b/Library/Homebrew/extend/os/search.rb
deleted file mode 100644
index 96e7ff28ec..0000000000
--- a/Library/Homebrew/extend/os/search.rb
+++ /dev/null
@@ -1,4 +0,0 @@
-# typed: strict
-# frozen_string_literal: true
-
-require "extend/os/mac/search" if OS.mac?
diff --git a/Library/Homebrew/search.rb b/Library/Homebrew/search.rb
index 674e956b40..632ab6e3c2 100644
--- a/Library/Homebrew/search.rb
+++ b/Library/Homebrew/search.rb
@@ -9,6 +9,8 @@ module Homebrew
   #
   # @api private
   module Search
+    module_function
+
     def query_regexp(query)
       if (m = query.match(%r{^/(.*)/$}))
         Regexp.new(m[1])
@@ -19,14 +21,25 @@ module Homebrew
       raise "#{query} is not a valid regex."
     end
 
-    def search_descriptions(string_or_regex, args)
-      return if args.cask?
+    def search_descriptions(string_or_regex, args, search_type: :desc)
+      both = !args.formula? && !args.cask?
+      eval_all = args.eval_all? || Homebrew::EnvConfig.eval_all?
 
-      ohai "Formulae"
-      CacheStoreDatabase.use(:descriptions) do |db|
-        cache_store = DescriptionCacheStore.new(db)
-        eval_all = args.eval_all? || Homebrew::EnvConfig.eval_all?
-        Descriptions.search(string_or_regex, :desc, cache_store, eval_all).print
+      if args.formula? || both
+        ohai "Formulae"
+        CacheStoreDatabase.use(:descriptions) do |db|
+          cache_store = DescriptionCacheStore.new(db)
+          Descriptions.search(string_or_regex, search_type, cache_store, eval_all).print
+        end
+      end
+      return if !args.cask? && !both
+
+      puts if both
+
+      ohai "Casks"
+      CacheStoreDatabase.use(:cask_descriptions) do |db|
+        cache_store = CaskDescriptionCacheStore.new(db)
+        Descriptions.search(string_or_regex, search_type, cache_store, eval_all).print
       end
     end
 
@@ -111,8 +124,33 @@ module Homebrew
       end.compact
     end
 
-    def search_casks(_string_or_regex)
-      []
+    def search_casks(string_or_regex)
+      if string_or_regex.is_a?(String) && string_or_regex.match?(HOMEBREW_TAP_CASK_REGEX)
+        return begin
+          [Cask::CaskLoader.load(string_or_regex).token]
+        rescue Cask::CaskUnavailableError
+          []
+        end
+      end
+
+      cask_tokens = Tap.flat_map(&:cask_tokens).map do |c|
+        c.sub(%r{^homebrew/cask.*/}, "")
+      end
+
+      results = cask_tokens.extend(Searchable)
+                           .search(string_or_regex)
+
+      results += DidYouMean::SpellChecker.new(dictionary: cask_tokens)
+                                         .correct(string_or_regex)
+
+      results.sort.map do |name|
+        cask = Cask::CaskLoader.load(name)
+        if cask.installed?
+          pretty_installed(cask.full_name)
+        else
+          cask.full_name
+        end
+      end.uniq
     end
 
     def search_names(query, string_or_regex, args)
@@ -136,5 +174,3 @@ module Homebrew
     end
   end
 end
-
-require "extend/os/search"
diff --git a/Library/Homebrew/test/search_spec.rb b/Library/Homebrew/test/search_spec.rb
index 56949f2340..ef3f383919 100644
--- a/Library/Homebrew/test/search_spec.rb
+++ b/Library/Homebrew/test/search_spec.rb
@@ -4,12 +4,6 @@
 require "search"
 
 describe Homebrew::Search do
-  subject(:mod) { Object.new }
-
-  before do
-    mod.extend(described_class)
-  end
-
   describe "#search_taps" do
     before do
       ENV.delete("HOMEBREW_NO_GITHUB_API")
@@ -17,13 +11,13 @@ describe Homebrew::Search do
 
     it "does not raise if `HOMEBREW_NO_GITHUB_API` is set" do
       ENV["HOMEBREW_NO_GITHUB_API"] = "1"
-      expect(mod.search_taps("some-formula")).to match(formulae: [], casks: [])
+      expect(described_class.search_taps("some-formula")).to match(formulae: [], casks: [])
     end
 
     it "does not raise if the network fails" do
       allow(GitHub::API).to receive(:open_rest).and_raise(GitHub::API::Error)
 
-      expect(mod.search_taps("some-formula"))
+      expect(described_class.search_taps("some-formula"))
         .to match(formulae: [], casks: [])
     end
 
@@ -47,22 +41,22 @@ describe Homebrew::Search do
 
       allow(GitHub::API).to receive(:open_rest).and_yield(json_response)
 
-      expect(mod.search_taps("some-formula"))
+      expect(described_class.search_taps("some-formula"))
         .to match(formulae: ["homebrew/foo/some-formula"], casks: ["homebrew/bar/some-cask"])
     end
   end
 
   describe "#query_regexp" do
     it "correctly parses a regex query" do
-      expect(mod.query_regexp("/^query$/")).to eq(/^query$/)
+      expect(described_class.query_regexp("/^query$/")).to eq(/^query$/)
     end
 
     it "returns the original string if it is not a regex query" do
-      expect(mod.query_regexp("query")).to eq("query")
+      expect(described_class.query_regexp("query")).to eq("query")
     end
 
     it "raises an error if the query is an invalid regex" do
-      expect { mod.query_regexp("/+/") }.to raise_error(/not a valid regex/)
+      expect { described_class.query_regexp("/+/") }.to raise_error(/not a valid regex/)
     end
   end
 end