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求正则表达式写法解决思路

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Release: 2016-06-13 11:48:59
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求正则表达式写法
1  $a="fweffeawf"    我要获取从第三个字母开始到第6个字母 怎么写? 就是effe
2  $b="www.baidu.com/aa/bb.php"    我想获取aa怎么写 获取bb.php又怎么写。。
------解决方案--------------------
完全不需要正则的东东。为何一定要正则?
substr($a,2,4);

basename($b);

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