Extract number from string in Ruby

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There are many Ruby ways as per http://www.ruby-forum.com/topic/125709

  1. line.scan(/\d/).join('')
  2. line.gsub(/[^0-9]/, '')
  3. line.gsub(/[^\d]/, '')
  4. line.tr("^0-9", '')
  5. line.delete("^0-9")
  6. line.split(/[^\d]/).join
  7. line.gsub(/\D/, '')

Try each on you console.

Also check the benchmark report in that post.

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