pull: fix tap name for linuxbrew

Library/Homebrew/dev-cmd/pull.rb

@@ -109,10 +109,10 @@ module Homebrew
       elsif (api_match = arg.match HOMEBREW_PULL_API_REGEX)
         _, user, repo, issue = *api_match
         url = "https://github.com/#{user}/#{repo}/pull/#{issue}"
-        tap = Tap.fetch(user, repo) if repo.start_with?("homebrew-")
+        tap = Tap.fetch(user, repo) if repo.match?(HOMEBREW_OFFICIAL_REPO_PREFIXES_REGEX)
       elsif (url_match = arg.match HOMEBREW_PULL_OR_COMMIT_URL_REGEX)
         url, user, repo, issue = *url_match
-        tap = Tap.fetch(user, repo) if repo.start_with?("homebrew-")
+        tap = Tap.fetch(user, repo) if repo.match?(HOMEBREW_OFFICIAL_REPO_PREFIXES_REGEX)
       else
         odie "Not a GitHub pull request or commit: #{arg}"
       end

Library/Homebrew/tap.rb

@@ -26,7 +26,7 @@ class Tap
 
     # We special case homebrew and linuxbrew so that users don't have to shift in a terminal.
     user = user.capitalize if ["homebrew", "linuxbrew"].include? user
-    repo = repo.delete_prefix "homebrew-"
+    repo = repo.sub(HOMEBREW_OFFICIAL_REPO_PREFIXES_REGEX, "")
 
     return CoreTap.instance if ["Homebrew", "Linuxbrew"].include?(user) && ["core", "homebrew"].include?(repo)
 

Library/Homebrew/tap_constants.rb

@@ -8,3 +8,4 @@ HOMEBREW_TAP_DIR_REGEX = %r{#{Regexp.escape(HOMEBREW_LIBRARY)}/Taps/(?<user>[\w-
 HOMEBREW_TAP_PATH_REGEX = Regexp.new(HOMEBREW_TAP_DIR_REGEX.source + %r{(?:/.*)?$}.source)
 # match official taps' casks, e.g. homebrew/cask/somecask or homebrew/cask-versions/somecask
 HOMEBREW_CASK_TAP_CASK_REGEX = %r{^(?:([Cc]askroom)/(cask|versions)|(homebrew)/(cask|cask-[\w-]+))/([\w+-.]+)$}.freeze
+HOMEBREW_OFFICIAL_REPO_PREFIXES_REGEX = /^(home|linux)brew-/.freeze