Description:
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http://php.net/manual/en/function.preg-quote.php

The preg_quote() example is a bad practice:

$textbody = "This book is *very* difficult to find.";
$word = "*very*";
$textbody = preg_replace ("/" . preg_quote($word) . "/",
                          "<i>" . $word . "</i>",
                          $textbody);


If the text would contain a '/' this would easily break and thus the example should include the delimiter, i.e.

preg_quote($word, "/")