From: Brian Candler <b.candler@...>
Date: 2009-12-07T02:45:42+09:00
Subject: Re: Regexp.escape with un-escapes

There is a feature in String#split (documented in 1.9, undocumented in 
1.8.6 but still present) whereby if the split RE contains capture 
groups, those capture groups will be included in the resulting array.

>> s = 'here is (a) setting \'a\' equal to ((\d+))'
=> "here is (a) setting 'a' equal to ((\\d+))"
>> Regexp.new(s.split(/(\(\(.*?\)\))/).map { |x| x =~ /\A\((\(.*\))\)\z/ ? $1 : Regexp.escape(x) }.join)
=> /here\ is\ \(a\)\ setting\ 'a'\ equal\ to\ (\d+)/
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