Here is an example of a valid regular expression for the US:
1((8([0]{2}|[6]{2}|[7]{2}|[8]{2})\d{7})|((?!\d[1]{2}|[5]{3})([2-9]\d{2})){2}\d{4})
Below is a list of country codes we have regular expressions we have verified to be working so far.
61
1
43
64
670
49
353
45
33
352
31
351
34
44
420
371
41
39
55
62
48
32
46
7
52
27
30
972
91
65
47
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