diff --git a/Library/Homebrew/livecheck/strategy/page_match.rb b/Library/Homebrew/livecheck/strategy/page_match.rb
index a238f75900..1ae9aba489 100644
--- a/Library/Homebrew/livecheck/strategy/page_match.rb
+++ b/Library/Homebrew/livecheck/strategy/page_match.rb
@@ -90,7 +90,7 @@ module Homebrew
         }
         def self.find_versions(url:, regex:, provided_content: nil, **_unused, &block)
           match_data = { matches: {}, regex: regex, url: url }
-          return match_data if url.blank? || regex.blank?
+          return match_data if url.blank? || (regex.blank? && block.blank?)
 
           content = if provided_content.is_a?(String)
             match_data[:cached] = true