From: Albert Schlef <albertschlef@...>
Date: 2009-01-25T09:40:19+09:00
Subject: Re: how to find the position of each match within a string

Rados��aw Bu��at wrote:
>>> You can examine the $~ global MatchData object, in a couple of ways:
>>>
>>> irb(main):003:0> "ello-hello".scan('e') do |match|
>>> irb(main):004:1*   p $~.pre_match.size
>>> irb(main):005:1> end
>>> 0
>>> 6
>>
>> Interesting. Does that mean that String#scan() converts a String
>> argument to RegExp?
> 
> Yes it does, even if it search fixed-size string.

I'm shocked. Why does it do this? (this conversion)

And doesn't this mean that #scan is less efficient than it could have 
been? Isn't matching regexps slower than matching plain strings?
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