# File linkbot.rb, line 181
   def defining_method(pattern=nil, input=nil)
     if input =~ pattern
       @method_def << "\n " << $1.to_s
       if @method_def =~ /end # method_def/
         return def_method(@method_def)
       end
       return ''
     else
       return "#{input} doesn't match #{pattern}."
     end
   end