Swift中用正规表达式判断String是否是手机号码

func isTelNumber(num:NSString)->Bool
{
var mobile = "^1(3[0-9]|5[0-35-9]|8[025-9])\\d{8}$"
var  CM = "^1(34[0-8]|(3[5-9]|5[017-9]|8[278])\\d)\\d{7}$"
var  CU = "^1(3[0-2]|5[256]|8[56])\\d{8}$"
var  CT = "^1((33|53|8[09])[0-9]|349)\\d{7}$"
var regextestmobile = NSPredicate(format: "SELF MATCHES %@",mobile)
var regextestcm = NSPredicate(format: "SELF MATCHES %@",CM )
var regextestcu = NSPredicate(format: "SELF MATCHES %@" ,CU)
var regextestct = NSPredicate(format: "SELF MATCHES %@" ,CT)
if ((regextestmobile.evaluateWithObject(num) == true)
|| (regextestcm.evaluateWithObject(num)  == true)
|| (regextestct.evaluateWithObject(num) == true)
|| (regextestcu.evaluateWithObject(num) == true))
{
return true
}
else
{
return false
}
}