求正则表达式写法解决思路
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 $b="www.baidu.com/aa/bb.php" 我想获取aa怎么写 获取bb.php又怎么写。。完全不需要正则的东东。为何一定要正则？
substr($a,2,4);
basename($b);
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