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Use regex to match a Ruby substring, and reference it like an index

/ Published in: Ruby
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  1. # pass a Regexp into a String as if it were an Array index
  2.  
  3.  "cat"[/c/]
  4.  #=> "c" 
  5.  "cat"[/z/]
  6.  #=> nil
  7.  
  8.  
  9. # pass in an optional second argument, to return the content of the nth matching group
  10.  
  11.  re_phone = /(\d{3})-(\d{3})-(\d{4})/
  12.  "986-235-1001"[re_phone, 2]
  13.  #=> "235"

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