From: Albert Schlef <albertschlef@...>
Date: 2009-03-10T16:17:38+09:00
Subject: Regexp problem

I want to extract an "id" parameter from the URL. I use the following
code:

  url = "http://example.com/id=12345"
  id = url[ /(?<=id=)(\d+)/ ]
  puts id

But I get a SyntaxError telling me "undefined (?...) sequence".

Why?
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