From: Olivier Lance <bestiol@...>
Date: 2011-08-29T09:54:00+09:00
Subject: String#split resets regex captures variables (Ruby 1.8.7)

Hi,

I've just spent some time on this problem until I found the solution,
and I wanted to share it/ask for opinions on this:

I've got a string on which I try to match a regexp. If it matches, I
split the string with one of the captured groups, zip the resulting
array with an array of symbols and merge with a last symbol/string array
pair representing the captured separator.

Here's some code to give you an idea:

n = "a:c"
if n =~ /([a-z])([.:])([a-z])/
  p [:first, :second].zip(n.split($2)) | [[:separator, $2]]
end

(see pastie here: http://pastie.org/2445983)


The problem is, the resulting array will contain "nil" for :separator.
Apparently, String#split will reset all regexp-related variables... I
guess it uses regexp internally, but I haven't seen anything documenting
this behavior, and I honestly believed this code would work...

So what's your take on this? Does it feel natural/logical to you?
Should I file a bug to enhance Ruby's documentation?

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