It also incorrectly matches:
(
((555) 555-5555
()
(555 555-5555
1
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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It also incorrectly matches:
(e.g.((555) 555-5555()e.g.(555 555-55551e.g.1 1 555 555-5555It'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: