//判斷手機號碼格式是否正確
+ (BOOL)valiMobile:(NSString *)mobile
{
  mobile = [mobile stringByReplacingOccurrencesOfString:@" " withString:@""];
  if (mobile.length != 11)
  {
    return NO;
  }else{
    /**
     * 移動號段正則表達式
     */
    NSString *CM_NUM = @"^((13[4-9])|(147)|(15[0-2,7-9])|(178)|(18[2-4,7-8]))\\d{8}|(1705)\\d{7}$";
    /**
     * 聯通號段正則表達式
     */
    NSString *CU_NUM = @"^((13[0-2])|(145)|(15[5-6])|(176)|(18[5,6]))\\d{8}|(1709)\\d{7}$";
    /**
     * 電信號段正則表達式
     */
    NSString *CT_NUM = @"^((133)|(153)|(177)|(18[0,1,9]))\\d{8}$";
    NSPredicate *pred1 = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CM_NUM];
    BOOL isMatch2 = [pred1 evaluateWithObject:mobile];
    NSPredicate *pred2 = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CU_NUM];
    BOOL isMatch3 = [pred2 evaluateWithObject:mobile];
    NSPredicate *pred3 = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CT_NUM];
    BOOL isMatch4 = [pred3 evaluateWithObject:mobile];
 
    if (isMatch2 || isMatch3 || isMatch4) {
      return YES;
    }else{
      return NO;
    }
  }
}