From: Ruohao Li <liruohao@...>
Date: 2010-08-20T00:56:18+09:00
Subject: Re: Is this a bug of String#count?

Roger Pack wrote:
>>>> s = "a\u4e00"
> 
>>>> s.count("^a")
>> => 0
>> 
>> Why the above result is 0 not 1? After all there are 2 characters
>> in the string s. Is this a bug of String#count?
> 
> count returns the sum of occurrences of characters.  I don't see any ^a 
> in the original string...

But according to the documentation, "Any _other_str_ that starts with a 
caret (^)
is negated", thus the following behavior:
$ irb --simple-prompt
>> s = "abc"
=> "abc"
>> s.count("^a")
=> 2
There are two characters in s that is *not* "a".
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