How to validate phone numbers using regex

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I’m trying to put together a comprehensive regex to validate phone numbers. Ideally it would handle international formats, but it must handle US formats, including the following:

  • 1-234-567-8901
  • 1-234-567-8901 x1234
  • 1-234-567-8901 ext1234
  • 1 (234) 567-8901
  • 1.234.567.8901
  • 1/234/567/8901
  • 12345678901

I’ll answer with my current attempt, but I’m hoping somebody has something better and/or more elegant.

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