Pass the string instead of reconstructing it from a regexp

Library/Homebrew/cmd/search.rb

@@ -62,7 +62,7 @@ module Homebrew extend self
       if count == 0 and not blacklisted? query
         puts "No formula found for #{query.inspect}."
         begin
-          GitHub.find_pull_requests(rx) { |pull| puts pull }
+          GitHub.find_pull_requests(query) { |pull| puts pull }
         rescue GitHub::Error => e
           opoo e.message
         end

Library/Homebrew/utils.rb

@@ -308,12 +308,10 @@ module GitHub extend self
     issues_matching(name).select { |issue| issue["state"] == "open" }
   end
 
-  def find_pull_requests rx
+  def find_pull_requests query
     return if ENV['HOMEBREW_NO_GITHUB_API']
     puts "Searching pull requests..."
 
-    query = rx.source.delete('.*').gsub('\\', '')
-
     open_or_closed_prs = issues_matching(query).select do |issue|
       issue["pull_request"]["html_url"]
     end