Alleen letters Mod rewrite

preg_replace('~\W~', '', $je_string);

preg_replace('~\W~', '', $je_string);

[:punct:]

[:punct:]

[:blank:]

[:blank:]

function safeURL($string) {
    $string = preg_replace('~[[:punct:]]~D', '_', $string);
    $string = preg_replace('~[[:blank:]]~D', '-', $string);
    return $string;
}

function safeURL($string) {
    $string = preg_replace('~[[:punct:]]~D', '_', $string);
    $string = preg_replace('~[[:blank:]]~D', '-', $string);
    return $string;
}