# File lib/erubis/converter.rb, line 112
    def pattern_regexp(pattern)
      @prefix, @postfix = pattern.split()   # '<% %>' => '<%', '%>'
      #return /(.*?)(^[ \t]*)?#{@prefix}(=+|\#)?(.*?)-?#{@postfix}([ \t]*\r?\n)?/m
      #return /(^[ \t]*)?#{@prefix}(=+|\#)?(.*?)-?#{@postfix}([ \t]*\r?\n)?/m
      return /#{@prefix}(=+|-|\#|%)?(.*?)([-=])?#{@postfix}([ \t]*\r?\n)?/m
    end