From: Brian Candler <b.candler@...>
Date: 2010-01-08T21:55:32+09:00
Subject: Re: Stopping String Escaping.

Phil Cooper-king wrote:
> so after the sub section I loose two of the back slashes
> [code]
>   text.sub!(/##code\((\S+)\)(.+?)##code/m, code)
> [/code]

Ah yes, backslashes have a special interpretation in the 
string-replacement part of a (g)sub too: \1 means the first capture, \2 
means the second capture etc, so \\ means a single backslash.

Note that the replacement string here is two backslashes:

>> puts "abc".sub(/b/, "\\\\")
a\c
=> nil

The easy solution is to use the block form of sub instead.

>> puts "abc".sub(/b/) { "\\\\" }
a\\c
=> nil

You could simplify your code if you rewrote to use the block form of 
gsub anyway.

text.gsub!(/#>code\((\S+)\)(.+?)#>code/m) do |snip|
  ... make a string containing the marked-up code
end
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