php 获取字符串中数字的正则表达式

<?php
    $patterns = "/\d+/"; //第一种
    //$patterns = "/\d/";   //第二种
    $strs="left:0px;top:202px;width:90px;height:30px";
    preg_match_all($patterns,$strs,$arr);
    print_r($arr);

/***************运行结果*********************/  
//第一种
Array
(
    [0] => Array
        (
            [0] => 0
            [1] => 202
            [2] => 90
            [3] => 30
        )
)
//第二种
Array
(
    [0] => Array
        (
            [0] => 0
            [1] => 2
            [2] => 0
            [3] => 2
            [4] => 9
            [5] => 0
            [6] => 3
            [7] => 0
        )
)