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Asked: 2026-05-19T16:21:41+00:00

I am using following regex to convert digits into phone format. telephoneNumber = ‘1234567890’;

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I am using following regex to convert digits into phone format.

telephoneNumber = '1234567890';
var number = telephoneNumber.replace(/\D/g,''); 
newNumber = number.replace(/^(\d{3})(\d{3})(\d{4})$/, '($1)$2-$3'); // (123)456-7890

Problem is that if telephoneNumber.length is greater than 10 then it does nothing. I want to add extra digits in the end of the phone number.

For example:

change 1234567890 to (123)456-7890
change 1234567890111 to (123)456-7890111

What should I change in above regex.

Thanks.

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1 Answer

  1. Editorial Team

    Try changing the last line to this:
    newNumber = number.replace(/^(\d{3})(\d{3})(\d{4,})$/, '($1)$2-$3');

    I just added a comma after the \d{4 this tells it to take 4 or more digits.

    Also, I often use this site to test out my regex’s: http://gskinner.com/RegExr/ It’s VERY handy.

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