Ruby 1.9 regex as a hash key

Posted by Liutauras on Stack Overflow See other posts from Stack Overflow or by Liutauras
Published on 2011-03-15T11:32:07Z Indexed on 2011/03/16 0:09 UTC
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ruby

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regex

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hash

I am trying this example myhash = {/(\d+)/ => "hello"} with ruby 1.9.2p136 (2010-12-25) [i386-mingw32].
It doesn't work as expected (edit: as it turned out it shouldn't work as I was expecting):

irb(main):004:0> myhash = {/(\d+)/ => "hello"}
=> {/(\d+)/=>"Hello"}
irb(main):005:0> myhash[2222]
=> nil
irb(main):006:0> myhash["2222"]
=> nil

In Rubular which is on ruby1.8.7 the regex works.
What am I missing?

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