Address Regex

I just found a regex which seems to be working for .net but it refuses to give me any results for php.
Any Idea

<?php

$str = '12 Main Street';
$chars = preg_split('/^(.*\d\S*)\s(.*)$/', $str, -1, PREG_SPLIT_OFFSET_CAPTURE);
print_r($chars);

?>

PHP:

Ideal Output:

12 Main Street
  -> 12
  -> Main Street

15a Perth Road
  -> 15a
  -> Perth Road

Flat 3b Royal Court
  -> Flat 3b
  -> Royal Court 

PHP:

 

no regex expert here??

 

I suggest

$addresses = array ('15a Perth Road', 'Flat 3b Royal Court', '12 Main Street');
$pattern = '/^(.*\d+\w*)\s+(.*)$/';           // define the regexp

foreach($addresses as $address){
  $address = trim($address); // remove surrounding whitespace chars
  preg_match($pattern,$address,$chars);
  echo "<pre>";
  print_r($chars);
  echo '</pre></hr>';
}

PHP:

Output:

Array
(
    [0] => 15a Perth Road
    [1] => 15a
    [2] => Perth Road
)

Array
(
    [0] => Flat 3b Royal Court
    [1] => Flat 3b
    [2] => Royal Court
)

Array
(
    [0] => 12 Main Street
    [1] => 12
    [2] => Main Street
)

Code (markup):