fix 'cask info' for external repos with numbers

fixes 2 issues: error when username has a number, correct url for repos not on github

Library/Homebrew/cask/lib/hbc/cli/info.rb

@@ -20,7 +20,7 @@ module Hbc
         puts "#{cask.token}: #{cask.version}"
         puts Formatter.url(cask.homepage) if cask.homepage
         installation_info(cask)
-        puts "From: #{Formatter.url(github_info(cask))}" if github_info(cask)
+        puts "From: #{Formatter.url(repo_info(cask))}" if repo_info(cask)
         name_info(cask)
         artifact_info(cask)
         Installer.print_caveats(cask)
@@ -50,9 +50,11 @@ module Hbc
         puts cask.name.empty? ? Formatter.error("None") : cask.name
       end
 
-      def self.github_info(cask)
+      def self.repo_info(cask)
         user, repo, token = QualifiedToken.parse(Hbc.all_tokens.detect { |t| t.split("/").last == cask.token })
-        "#{Tap.fetch(user, repo).default_remote}/blob/master/Casks/#{token}.rb"
+        remote_tap = Tap.fetch(user, repo)
+        return "#{remote_tap.remote}" if remote_tap.custom_remote?
+        "#{remote_tap.default_remote}/blob/master/Casks/#{token}.rb"
       end
 
       def self.artifact_info(cask)

Library/Homebrew/cask/lib/hbc/qualified_token.rb

@@ -3,7 +3,7 @@ module Hbc
     REPO_PREFIX = "homebrew-".freeze
 
     # per https://github.com/Homebrew/homebrew/blob/4c7bc9ec3bca729c898ee347b6135ba692ee0274/Library/Homebrew/cmd/tap.rb#L121
-    USER_REGEX = %r{[a-z_\-]+}
+    USER_REGEX = %r{[a-z0-9_\-]+}
 
     # per https://github.com/Homebrew/homebrew/blob/4c7bc9ec3bca729c898ee347b6135ba692ee0274/Library/Homebrew/cmd/tap.rb#L121
     REPO_REGEX = %r{(?:#{REPO_PREFIX})?\w+}