I constantly use the below reg exp when I am trying to identify routes in a country
(example using the 46 country code for Sweden)
^([+]?|00)(46).*$
This way I send all requests
+46XXXXXXXXXX
46XXXXXXXXXX
0046XXXXXXXXXXX
Of course my regexp does not filterwhat's coming after the country code but this is not really my problem but the senders.
Still if you need to filter that one too go with the below
^([+]?|00)(46)\d+$