us_phone_fields

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US phone number with optional leading 1, optional area code, and optional delimiters (hyphen, space or period)

VALID

18005551212

1.800.555.1212

1-800-555-1212

(800)555-1212

8005551212

800-555-1212

800.555.1212

5551212

555-1212

555.1212

INVALID

2-800-555-1212

55-5212

551212

15551212