Regular Expression of the day

Match generic US phone numbers. Ignore 1-9 repeating (ie: 4444444444, 1111111111, (except 7, we want 7777777777 for testing)). Allow for spaces, no spaces, dashes, or period delimiters.

Of course we _should_ use a standard phone number regex, but this project calls for something unique.

RegEx is weird, but fun.