Change format of phone number

Question

I have string with phone number that I need to transform from one format to another.

Example:

"02030266079" => "0203 026 6079"

I tried:

$num = "02030266079";
$transformed= preg_replace("/^(/d{4})(/d{3})(/d{4})$/", "$1 $2 $3", $num);

But nothing happens!

Answer 1

$number = "12345678901";
$formatted_number = preg_replace("/^(\d{4})(\d{3})(\d{4})$/", "$1 $2 $3", $number);

It is php code and well tested, It works perfectly