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<?php
header("Content-type:text/html;charset=utf-8");
$str="fdsafsdafsgfdag1223fa1551sdfassd3265";
$mypreg="/(\d)(\d)\2\1/";//匹配abba式的数字,即上面的1551
$mycon="这是数字";
$str=preg_replace($mypreg,$mycon,$str);
echo $str."<br/>";
$str="fasdgasgdfgfduuuuuu1221uuuuufasdfsdfsdaf4444";
$mypreg='/(\d)\1{3}/i';
$mycon="这是数字";
echo $str."<br/>";
$str=preg_replace($mypreg,$mycon,$str);
echo $str."<br/>";
因为PHP的\在双引号中会起转义作用$a = "/(\d)(\d)\2\1/";
$b = '/(\d)(\d)\2\1/';
var_dump($a == $b);
var_dump($a, $b);
bool(false) string(12) "/(\d)(\d)/" string(14) "/(\d)(\d)\2\1/"
要这样$a = "/(\d)(\d)\\2\\1/";
$b = '/(\d)(\d)\2\1/';
var_dump($a == $b);
var_dump($a, $b);
bool(true) string(14) "/(\d)(\d)\2\1/" string(14) "/(\d)(\d)\2\1/"
所以你会看到一些正则表达式中会有一连串的 \
\\\、\\\\....
总之是不对就加一个$str="fdsafsdafsgfdag1223fa1551sdfassd3265";
$mycon="这是数字";
$str=preg_replace('/(\d)(\d)\2\1/',$mycon,$str);
echo $str."<br/>";
fdsafsdafsgfdag1223fa这是数字sdfassd3265<br/>
但直接复制你的代码就不行
估计是你的编辑器有问题