modifier.regex_replace.php

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<?php
function smarty_modifier_regex_replace($string, $search, $replace)
{
    if(is_array($search)) {
        foreach($search as $idx => $s) {
            $search[$idx] = _smarty_regex_replace_check($s);
        }
    } else {
        $search = _smarty_regex_replace_check($search);
    }
    return preg_replace($search, $replace, $string);
}

function _smarty_regex_replace_check($search)
{
    // null-byte injection detection
    // anything behind the first null-byte is ignored
    if (($pos = strpos($search,"\0")) !== false) {
        $search = substr($search,0,$pos);
    }
    // remove eval-modifier from $search
    if (preg_match('!([a-zA-Z\s]+)$!s', $search, $match) && (strpos($match[1], 'e') !== false)) {
        $search = substr($search, 0, -strlen($match[1])) . preg_replace('![e\s]+!', '', $match[1]);
    }
    return $search;
}

?>