- file_get_contents: documentation ( source)
- preg_match: documentation ( source)
<?php
$source = file_get_contents("http://www.pasosfronterizos.gov.cl/cf_pehuenche.html");
if ( preg_match('|<td class="txt_noticia"><strong>Observaciones</strong></td><td valign="top">(.*?)</td>|is',$source,$cap) )
{
echo $cap[1];
}