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Validation of the telephone number not having all the digits repeated
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Validation of the telephone number not having all the digits repeated
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I want to validate a telephone number of foramt (xxx) xxx-xxxx. This number should not contain all repeating digits. i.e, I have to validate if the user enters a number like (999) 999-9999. But should allow any other format. How to write a regular expression for this.
Please help.
Thanks, Siri
To validate a North American style phone number you could use:
\(?\d{3}\)?[- ]?\d{3}-?\d{4}
This allows the repeating digits. To filter those out, you could run a second regex that uses backreferences to validate all the following digits match the first digit match. Here is a regex with phone formatting optional:
\(?(\d)\1\1\)?[- ]?\1{3}-?\1{4}
Tags
regex
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