<?php
$string = 'Você está bem? 123 # ! @ ...';
echo "\n";
echo 'Text 2: '. preg_replace('/[^\w\s+$]/u', '_', $string); ?>
PD9waHAKJHN0cmluZyA9ICdWb2PDqiBlc3TDoSBiZW0/IDEyMyAjICEgQCAuLi4nOwplY2hvICdUZXh0IDE6Jy4gcHJlZ19yZXBsYWNlKCcvW15cd1xzKyRdL3UnLCAnXycsICRzdHJpbmcpOwoKZWNobyAiXG4iOwoKJHN0cmluZyA9IHV0ZjhfZGVjb2RlKCdWb2PDqiBlc3TDoSBiZW0/IDEyMyAjICEgQCAuLi4nKTsKZWNobyAnVGV4dCAyOiAnLiBwcmVnX3JlcGxhY2UoJy9bXlx3XHMrJF0vdScsICdfJywgJHN0cmluZyk7Cj8+