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string preg_quote ( string $str [, string $delimiter = NULL ] )

<?php
$keywords = '$40 for a g3/400';
$keywords = preg_quote($keywords, '/');
echo $keywords; 
?>

Returns \$40 for a g3\/400

<?php
// In this example, preg_quote($word) is used to preserve the literal meaning of asterisks, preventing them from being interpreted as special regex characters.

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

This book is <i>*very*</i> difficult to find.