title: Regex to match number of digits in a phone string?
body: <p>Trying to put together regex that can match minimum 4 digits, maximum 16 digits, and those digits can be separated by characters: ()- x+ (but should not be part of the min/max count).</p>
  
  <p>ie. "555-123-4567" would return true, "1-234" is true, "+44(55)123-3333" is true, "abcd1" is false, "1-()-4++++-()-6" is false.</p>
  
  <p>Any way to do that with purely regex? Trying a couple expressions but not working.</p>