quick and dirty address validation

index.php

<?php

$regex = "/^[\w'\s\p{L}-]*$/u";
$test = preg_match($regex, "8 rue du marché");
$test2 = preg_match($regex, "5 rue de l'apostrophe");
$test3 = preg_match($regex, "10 rue du passage \n à la ligne");

echo "\n";
echo !$test ? "test KO" : "test OK";
echo "\n";
echo "\n";
echo !$test2 ? "test2 KO" : "test2 OK";
echo "\n";
echo "\n";
echo !$test3 ? "test3 KO" : "test3 OK";
echo "\n";