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PHP- How do I search through an HTML document and extract certain strings in php?
<?php
$str = file_get_contents("comment.txt");
preg_match_all ('/^(user/)/[A-Z0-9][A-Z0-9_-]+"$/i', $str, $preg);
print_r ($preg);
?>

Array ( [0] => Array ( ) [1] => Array ( ) )

<html>
  <body>
    <a href="/user/boy30" />
    <a href="/user/boy31" />
    <a href="/user/boy32" />
  </body>
</html>

Array
(
    [0] => Array
        (
            [0] => "/user/boy30"
            [1] => "/user/boy31"
            [2] => "/user/boy32"
        )

    [1] => Array
        (
            [0] => boy30
            [1] => boy31
            [2] => boy32
        )

)