java - Regular expression for phone number validation -


Hello, I need regex for phone number verification for the following format 

  + 1-646 -222-3333   
 I have written the expression like  
  ^ (+) ([0- 9] {3} - [0- 9] {3} - [0- 9] {4})   
 But its not working Do I know why I did wrong?   
 
 
 Try it out:  
  string str = "+ 1-646 -222-3333 "; If (str.matches ("\\ + \\ d - \\ d {3} - \\ d {3} - \\ d {4}")) {System.out.println ("valid number"); } Else {System.out.println ("Invalid Number"); }

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