From: Ralph Shnelvar <ralphs@...32.com>
Date: 2010-11-21T07:13:28+09:00
Subject: gsub and backslashes

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Consider the string
  \1\2\3
that is
  "\\1\\2\\3"

I feel really stupid ... but this simple substitution pattern does not do what I expect.

  "\\1\\2\\3".gsub(/\\/,"\\\\")

What I want is to change single backslashes to double backslashes.  The result of the above substitution is "no change"

On the other hand
  "\\1\\2\\3".gsub(/\\/,"\\\\\\\\")
does do what I want ... but I am clueless as to why.
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