PHP extract all dates from string using Regular Expressions

Question

I need help please. I would like to extract all dates from the string below. Any help using regex or any other function? I tried using the PHP code below but I'm getting an error: Warning: preg_match(): Compilation failed: missing closing parenthesis at offset 13.

<?php
$matches = [];
if (preg_match('/b>|-(.*?)-| (/', $dates["scheduled"], $matches) == 1) {
  var_dump($matches);
}
?>

Thanks.

<br>5449431|&nbsp;<b style='color:orange;'>SCHEDULED&nbsp;</b>|04/02/2021| ($56.49)<br>
<br>5449616|&nbsp;<b style='color:orange;'>SCHEDULED&nbsp;</b>|04/09/2021| ($51.49)<br>
<br>_______|&nbsp;<b style='color:orange;'>SCHEDULED&nbsp;</b>|04/16/2021| ($51.49)<br>

Answer 1

You need to escape the regex meta characters | and ( and remove those - characters, like this:

<?php
$matches = [];
if (preg_match('/b>\|(.*?)\| \(', $dates["scheduled"], $matches) == 1){
  var_dump($matches);
}
?>