取子串的正则表达式

<?php
$str = "<str1>name1</str1><str2>name2</str2>";
$patten  = "/<str\d+>([^<]*)<\/str\d+>/isU";
preg_match_all($patten,$str,$matches);
print_r($matches[1]);

$str = "<str1>name1</str1><str2>name2</str2>";
preg_match_all('/>([^<]+)</U', $str, $matches);
print_r($matches[1]);
/**
输出结果：
Array ( [0] => name1 [1] => name2 ) 
*/

preg_match_all("/>[^<]+</",$str,$m);
print_R($m[1]);