PHP phone number validation – revisited

Several months ago, when I was first getting familiar with regular expression, I made a post talking about PHP form validation for phone numbers and email addresses.

A couple of days ago, I revisited that post and realized how inefficient my function actually was. The entire point of regex is to recognize multiple patterns within 1 statement. Here is my revised regular expression.

{code type=php}
/^(\d[\s-]?)?[\(\[\s-]{0,2}?\d{3}[\)\]\s-]{0,2}?\d{3}[\s-]?\d{4}$/i
{/code}

This single function detects for all the patterns in the original post and more.

Example

{code type=php}
$phone_numbers = array(
‘555-555-5555’,
‘5555425555’,
‘555 555 5555’,
‘1(519) 555-4444’,
‘1 (519) 555-4422’,
‘1-555-555-5555’,
‘1-(555)-555-25555’,
);
$regex = “/^(\d[\s-]?)?[\(\[\s-]{0,2}?\d{3}[\)\]\s-]{0,2}?\d{3}[\s-]?\d{4}$/i”;
foreach( $phone_numbers as $number ) {
echo $number . ‘: ‘ . ( preg_match( $regex, $number ) ? ‘valid’ : ‘invalid’ ) . ‘
‘;
}{/code}

Output

{code type=php}
555-555-5555: valid
5555425555: valid
555 555 5555: valid
1(519) 555-4444: valid
1 (519) 555-4422: valid
1-555-555-5555: valid
1-(555)-555-5555: valid
1-(555)-555-25555: invalid
{/code}