build_regex_redirected lazy

lib/formatters/ansi_formatter.rb

@@ -31,7 +31,6 @@ class AnsiFormatter < SemanticLogger::Formatters::Color
   end
 
   def call(log, logger)
-    @regex_redirected ||= build_regex_redirected # called once when Rails gets ready!
     log = alter(log)
 
     self.log = log
@@ -121,6 +120,7 @@ class AnsiFormatter < SemanticLogger::Formatters::Color
           end
         elsif log.message =~ /Redirected/
           log.level = :debug
+          @regex_redirected ||= build_regex_redirected # called once when Rails gets ready!
           log.message = two_captures_last_as_bold(log.message, @regex_redirected)
         end
       elsif log.exception