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Discussion on: RegEx in JavaScript with a cool project 🔥

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FJones • Edited on

It also incorrectly matches:

  1. Multiple opening ( e.g. ((555) 555-5555
  2. Mismatched () e.g. (555 555-5555
  3. Multiple leading 1 e.g. 1 1 555 555-5555

It's important to consider both positive and negative constraints for the resulting regular language.

This should be a bit closer, but also not entirely accurate for certain edge cases:

/^(1 )?(\d{3}|\(\d{3}\))[ -]?\d{3}[ -]?\d{4}/
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