From: "Lucas W." <lucas.wiman@...>
Date: 2012-01-21T06:15:42+09:00
Subject: Re: [regexp] How to convert string "/regexp/i" to /regexp/i - ?

In the spirit of http://xkcd.com/979/ here's a better answer:
http://rubygems.org/gems/to_regexp
This gem solves the problem.  Source: 
http://stackoverflow.com/questions/6669425/convert-a-regular-expression-in-a-string-to-a-regexp-object-in-ruby/6669653#6669653

Once this gem is installed, you can call String#to_regexp and all is 
well.

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