title: REGEXEXTRACT - Error when trying to get a phone number from sting
body: <p>I am wondering if someone can help me get this formula right in google spreadsheets.</p>
  
  <p>After a 2 week event I do get a spreadsheet with more that 2000 rows of comments which include phone numbers here and there. I am trying to extract the phone numbers from those strings.</p>
  
  <p>example string: call at 228-219-4241 after</p>
  
  <p>formula: =IFERROR(REGEXEXTRACT(V133,"^(?(?:\d{3}))?[-.]?(?:\d{3})[-.]?(?:\d{4})$"),"NOT FOUND!!!")</p>
  
  <p>and I do  get "NOT FOUND!!!!</p>
  
  <p><a href="http://i.stack.imgur.com/uVeMN.jpg" rel="nofollow">image from gsheet... NOT FOUND!!!</a></p>
  
  <p>But it works only in this case..</p>
  
  <p><a href="http://i.stack.imgur.com/tYML9.jpg" rel="nofollow">just the number</a></p>
  
  <p>Cheers.</p>