title: Remove dash from a phone number
body: <p>What regular expression using java could be used to filter out dashes '-' and open close round brackets from a string representing phone numbers...</p>
  
  <p>so that (234) 887-9999 should give 2348879999
  and similarly 234-887-9999 should give 2348879999.</p>
  
  <p>Thanks,</p>