From: Nobuyoshi Nakada <nobu@...>
Date: 2007-06-20T10:03:31+09:00
Subject: Re: Check for text file

Hi,

At Wed, 20 Jun 2007 08:22:51 +0900,
Daniel DeLorme wrote in [ruby-talk:256241]:
> Still, I have to say I was surprised; I didn't know that a hyphen in 
> String#count had the same effect as in a regexp character class. Talk 
> about an undocumented feature!

It's documented.

It can be
  s.count("^\t\n -~").to_f/s.size>0.3

-- 
Nobu Nakada