Hola,
Posiblemente,
Código PHP:
<?php
$p = <<<EOF
<table>
<tr><td class="value">1000</td></tr>
<tr><td class="other" style="background-color: red">2000
</td></tr>
<tr>
<td>
3000 documentos
</td></tr>
<tr><td class="noclass"></td></tr>
</table>
EOF;
echo preg_match_all('/<td.*>\s*\b(.+)\s*<\/td>/Uis', $p, $r);
print_r ($r);
?>
Saludos,