el Error Con esto lo puedes Solucionar.
if(isset($coincidencias[1])){ Código PHP:
<?php
$str = file_get_contents("http://www.threatexpert.com/report.aspx?md5=2a306cc6ac1767d5548529285ec0cd45");
$text1 = ereg_replace("</td>", " ", $str);
$text2 = ereg_replace("<br>", " ", $text1);
$text3 = ereg_replace("\"", " ", $text2);
$text = ereg_replace("</li>", " ", $text3);
$swear = array("http://www.threatexpert.com", "<td>", "</tr>", "<tr>", "<li>", "<br>");
foreach($swear as $key=> $value){
$text = str_replace("$value", " ", $text);
}
$regExp1="/[^.]+\.[^.]+$/i";
preg_match($regExp1, $text, $coincidencias);
//---------------------------
if(isset($coincidencias[1])){
//---------------------------
$count = count($coincidencias[1]);//error aqui
for ($row = 0; $row < $count ; $row++) {
echo $coincidencias[1][$row]."<br>";
}
//---------------------------
}//else{ Otra cosa }
//---------------------------