Regular Expression to Validate Us Phone Numbers? [Duplicate]
Possible Duplicate: a Comprehensive Regex for Phone Number Validation Validate Phone Number with Javascript I'm Trying to Write a Regular Expression to...
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Possible Duplicate:
A comprehensive regex for phone number validation
Validate phone number with JavaScript
I'm trying to write a regular expression to validate US phone number of format (123)123-1234 -- true 123-123-1234 -- true
every thing else in not valid.
I came up something like
^\(?([0-9]{3}\)?[-]([0-9]{3})[-]([0-9]{4})$
But this validates, 123)-123-1234 (123-123-1234
which is NOT RIGHT.
The easiest way to match both
^\([0-9]{3}\)[0-9]{3}-[0-9]{4}$
and
^[0-9]{3}-[0-9]{3}-[0-9]{4}$
is to use alternation ((...|...)): specify them as two mostly-separate options:
^(\([0-9]{3}\)|[0-9]{3}-)[0-9]{3}-[0-9]{4}$
By the way, when Americans put the area code in parentheses, we actually put a space after that; for example, I'd write (123) 123-1234, not (123)123-1234. So you might want to write:
^(\([0-9]{3}\) |[0-9]{3}-)[0-9]{3}-[0-9]{4}$
(Though it's probably best to explicitly demonstrate the format that you expect phone numbers to be in.)
Sarah Jenkins is a veteran tech journalist with over 12 years of experience covering artificial intelligence, mobile innovations, and digital ethics. Her insights have appeared in leading technology publications worldwide.
