function getMetas($link) {
    $str1 = file_get_contents($link);

   if (strlen($str1)>0) {
     preg_match_all( '#<meta name="description".*content="([^"]+)">#siU', $str1,     $description);
  if (count($description) > 1) {
        return $description[1];
    }
  if (!$description) {
 preg_match("/<s*p[^>]*>([^<]*)<s*/s*ps*>/", $str1, $re);
$res = get_custom_excerpt($re[1]);
echo $res;

   }

  }
   return '';


    }

<?php
$html = '<div class="red">Jul 6, 2012</div>
<div class="blue">12,889.40</div>
<p>12,889.40</p>
<div class="green">12,702.99</div>
<div class="black">12,772.47</div>
<div class="purple">967,600</div>
<div class="grey">12,772.47</div>
<div class="red">Jul 5, 2012</div>
<div class="blue">12,941.85</div>
<p class="yellow">12,961.30</p>
<div class="green">12,852.24</div>
<div class="black">12,896.67</div>
<div class="purple">978,000</div>
<div class="grey">12,896.67</div>';

preg_match("/<s*p[^>]*>([^<]*)<s*/s*ps*>/", $html, $re);
$res = get_custom_excerpt($re[1]);
echo $res;

function get_custom_excerpt($return, $option = 20, $sentance = false) {
  $marks = Array(".","!","?");

  $return = strip_tags($return);

  if($sentance == true) {
    $start = implode(" ", array_slice(preg_split("/s+/", $return), 0, $option ));
    $start .= ' ';
    $end = implode(" ", array_slice(preg_split("/s+/", $return), $option));

    $cut = Array();
    foreach($marks AS $m => $mark){
      $mark = strpos($end, $mark);
      if($mark != false) $cut[$m] = $mark;
    }

    if($cut[0] != "")
     $chop = min($cut);
    else
     $chop = $option;
    $rest = substr($end, 0, $chop);

    $key = array_search($chop, $cut);

    $return = $start.$rest;

  }else{
    $return = implode(" ", array_slice(preg_split("/s+/", $return), 0, $option));
  }
  $return .= $marks[$key];

  return $return;
}
?>

<?php
$matches;
$html = "<p>some text</p>";
preg_match_all("/(<p[^>]*>)(.*?SOMERESTRICTION.*?)(</p>)/"
        , $html
        , $matches
        , PREG_SET_ORDER
);
//matches
print_r( $matches );
?>