PHP - Validate phone number

Question

I need to validate phone number in PHP, but the example below do not work.

$phone = '(123) 458-1542';

if(preg_match("/^([0-9]{3})-[0-9]{3}-[0-9]{4}$/", $phone)) {

}

Is the number in your example supposed to be valid or invalid? How should we know? If you need to build / check / validate regex, use a tool for that, for example: regex101.com — Smuuf
– Smuuf, Commented Apr 19, 2016 at 11:05

Zain Zafar · Accepted Answer · 2016-04-19 11:02:12Z

4

Use this regex:

^\(*\+*[1-9]{0,3}\)*-*[1-9]{0,3}[-. /]*\(*[2-9]\d{2}\)*[-. /]*\d{3}[-. /]*\d{4} *e*x*t*\.* *\d{0,4}$

Following phone numbers have been tested:

1-234-567-8901
1-234-567-8901 x1234
1-234-567-8901 ext1234
1 (234) 567-8901
1.234.567.8901
1/234/567/8901
12345678901
1-234-567-8901 ext. 1234
(+351) 282 433 5050

Example: http://www.regexr.com/3bp4b

answered Apr 19, 2016 at 11:02

Zain Zafar

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1 Comment

Ankh Over a year ago

Best answer so far. The others are too strict with spaces/hyphens/brackets etc

Wiktor Stribiżew · Accepted Answer · 2016-04-19 10:58:00Z

3

Add a space and escape the round brackets:

^\([0-9]{3}\)[- ][0-9]{3}-[0-9]{4}$
 ^^        ^^^^^^

See the demo

I added a character class [- ] just in case there can be either a space or a hyphen after the area code. Parentheses must be escaped in order to be treated as literal symbols and not as a grouping construct.

PHP demo:

$phone = '(123) 458-1542';
if(preg_match('~^\([0-9]{3}\)[- ][0-9]{3}-[0-9]{4}$~', $phone)) {
    echo "Matched: $phone";
}

answered Apr 19, 2016 at 10:58

Wiktor Stribiżew

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