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AddEventHandler("main", "OnEndBufferContent", "ChangeMyContent");
function ChangeMyContent(&$content)
{
   $search = array(
        '<a(.*?)href="/company/">О компании</a>'
    );
    $replace = array(
        '<a$1href="/new-link/">О компании</a>'
    );
    $content = preg_replace($search, $replace, $content);
}

$search = array(
        '/\>[^\S ]+/s', //strip whitespaces after tags, except space
        '/[^\S ]+\</s', //strip whitespaces before tags, except space
        '/(\s)+/s'  // shorten multiple whitespace sequences
        );
    $replace = array(
        '>',
        '<',
        '\\1'
        );