php 正则字串

';print_r($str[3]);  <br />  <br />     不能动态获取  <br />  <br />     怎么用正则获取？谢谢！  <br />  <p>  </p>
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                            <a href="/xiazai/js/5926">仿支付宝6位数字密码正则判断.zip</a>
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                 </p> <br /> <h2>回复讨论(解决方案)</h2> <p class="sougouAnswer">  <pre class="sycode" name="code">$a = '../post/luoji/soft/aaa.chm';$a=pathinfo($a,PATHINFO_BASENAME);echo $a;

$a = '../post/luoji/soft/aaa.chm';preg_match('#[^/]+$#', $a, $r);echo $r[0];

$a = '../post/luoji/soft/aaa.chm';$a = preg_split('#/#', $a);echo array_pop($a);

$a = '../post/luoji/soft/aaa.chm';$a = preg_split('#/#', $a);echo end($a);

$a = '../post/luoji/soft/aaa.chm';echo basename($a);