Actually, it probably could write really good test cases. they tend to be boring and verbose.

It's only test data but you get the point

Sure, here are some examples of phone numbers in various formats:

(123) 456-7890 123-456-7890 +1 (123) 456-7890 1-800-123-4567 555.123.4567 123.456.7890 1234567890 (123) 456-7890 ext. 123 +44 123 456 7890 (international format) 011 44 123 456 7890 (international access code format) 123/456-7890 123\456-7890 (123) 456-7890 x1234 (with extension) 123-456-7890 x1234 (with extension) 1 (123) 456-7890 (with country code)