$re = '/<[a-zA-Z-0-9]+\s?>([\w]+)<\/[a-zA-Z-0-9]+\s?>/';
$str = '<T1>value1</T1>
<T1001>value2</T1001>
<T2000 />
<SomeValue>value1</SomeValue >
<A2ndValue>value2</A2ndValue >';
preg_match_all($re, $str, $matches, PREG_SET_ORDER, 0);
// Print the entire match result
var_dump($matches);
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for PHP, please visit: http://php.net/manual/en/ref.pcre.php