PHP Regex Problem

function _parseResultDetailTargetIp($upper)
    {
        // Grab the first IP addr we can find. Most ping flavors
        // put the target IP on the first line, but some only list it
        // in successful ping packet lines.
        for ( $i=0; $i<count($upper); $i++ ) {
            if ( preg_match('/(\d+\.\d+\.\d+\.\d+)/', $upper[$i], $matches) ) {
                return( $matches[0] );
            }
        }
        // no idea...
        return( NULL );
    }

function _parseResultDetailTargetIp($upper)
    {
        // Grab the first IP addr we can find. Most ping flavors
        // put the target IP on the first line, but some only list it
        // in successful ping packet lines.
        for ( $i=0; $i<count($upper); $i++ ) {
            if ( preg_match('/(\d+\.\d+\.\d+\.\d+)/', $upper[$i], $matches) ) {
                return( $matches[0] );
            }
            if (  preg_match('/^(((?=(?>.*?(::))(?!.+3)))3?|([dA-F]{1,4}(3|:(?!$)|$)|2))(?4){5}((?4){2}|(25[0-5]|(2[0-4]|1d|[1-9])?d)(.(?7)){3})z/i', $upper[$i], $matches) ) {
                return( $matches[0] );
            }
        }


        // no idea...
        return( NULL );
    }