title: gsub numbers and +
body: <p>I'm saving a number with <code>params[:number].gsub(/\D/,'')</code>, but I don't want to strip the plus symbol: <code>+</code></p>
  
  <p>For example if a user saves number <code>+1 (516) 949-9508</code> it saves as <code>15169499508</code> but how can we preserve the <code>+</code> as <code>+15169499508</code>?</p>