How to make a more efficient solution (Regex to find mistakes in parenthesis)

[Eldhose]

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Need Help - Telephone Number Validator

1 555-5555555- ^(1\s?) ? ((\d{3})|\d{3})[\s-]?\d{3}[\s-]?\d{4}$ for example we have number 1234.or 1456 . what we want to map is the first character should be one so that /^1(\d{3})/ we can use this code . it wont care what are the three followed number after one. so if i write 1234 it match or 1245 it will match . but if i say 2345 it wont match. so what i try to say is. if ^ is the before any letter or number we can only map renaming number followed by the first character. so we got a s…