<?php
$str = "
jkljkljlkjkljkljkljkljkl
<table border='0' cellspacing='0' cellpadding='0'>
<tr class='che'>
<td>
abc.xxxxxxxxxxxx =>Unavailable
</td>
<td>
<a href='#' target=_blank>一 </a>
</td>
</tr>
<tr class='che'>
<td>
abc.xxxxxxxxxxxx =>Unavailable
</td>
<td>
<a href='#' target=_blank>二 </a>
</td>
</tr>
...
</table>
jlkjoidsklvjsdlkjalksdjas
";
preg_match_all('/abc\.(\w+)(\s+)=>Unavailable/i',$str,$arr); 
var_dump($arr);
?>这样就可以了