--- Readline.completion_proc= proc
    䴰ưꤹProc֥Ȥꤷޤ
    procϰʸꡢʸ֤褦
    Ƥ
    ʸñ줴Ȥ˶ڤޤ
    bash䴰Ʊ/[ \t\n\"\\'`@$><=;|&{(]/ñ˶ڤޤ

        require 'readline'

        WORDS = %w(foo foobar foobaz)

        Readline.completion_proc = proc {|word|
            WORDS.grep(/^#{Regexp.quote word}/)
        }

        while buf = Readline.readline("> ")
          p buf
        end

