Function in PHP to split Dutch addresses as a string, to an array with street, number and addition apart

split_street.php

<?php
function split_street(string $streetStr) :array {
    $aMatch         = array();
    $pattern        = '#^([\w[:punct:] ]+) (\d{1,5})\s?([\w[:punct:]\-/]*)$#';
    preg_match($pattern, $streetStr, $aMatch);
    $street         = $aMatch[1] ?? $streetStr;
    $number         = $aMatch[2] ?? '';
    $numberAddition = $aMatch[3] ?? '';
    return array('street' => $street, 'number' => $number, 'numberAddition' => $numberAddition);
}

Any idea how to get this working with foreign characters? Uberstrasse 123 works, Überstrasse 123 doesn't.

try the pattern as unicode:
$pattern = '/^([\w[:punct:] ]+) (\d{1,5})\s?([\w[:punct:]\-\/]*)$/u';