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Quickly match first instance of a regex in Ruby (See related posts)

I recently saw a clever Ruby idiom to return the first regex match within a string in Ruby:

irb> x = "this is a 1234 test"
irb> x[/\d+/]
=> "1234"
irb> x[/\w+/]
=> "this"
to ruby regex by peter on Tue Jan 31 16:20:15 -0500 2006

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