关于使用preg_replace（）

Question

For the purpose of testing, this is the code I'm using on my regular expression:

<?php
function handlePhone($p) {
    return preg_replace("[^0-9xX\+]", "", $p);
}

echo handlePhone("+44(324)-s123-32yousuck42x123");
?>

Right now, all that's printing is that exact string as if no changes were made. Any ideas why?

Answer 1

You must use delimiters at the end and begining of your pattern, example with / :

function handlePhone($p) {
    return preg_replace("/[^0-9xX\+]/", "", $p);
}

Note that you can use other delimiters: ~ # @ ...