请问一个SQL语句替换有关问题，

请教一个SQL语句替换问题，在线等！！！！！
做一个分页的。
想把形如：

SELECT u.id,u.name FROM user as u ORDER BY u.id DESC LIMIT 0 10
SELECT u.id,u.name FROM user as u WHERE u.id=12 ORDER BY u.id DESC

替换成

SELECT COUNT(*) FROM user as u ORDER BY u.id DESC LIMIT 1
SELECT COUNT(*) FROM user as u WHERE u.id=12 ORDER BY u.id DESC LIMIT 1


也就是形式如

SELECT xxxxx FROM ***** WHERE ***** ORDER BY **** LIMIT XXXXX
SELECT xxxxx FROM ***** WHERE ***** ORDER BY **** 

其中 XXXXX 部分进行替换。



PHP 怎么写正则。。。

[解决办法]

PHP code

$str="SELECT u.id,u.name FROM user as u WHERE u.id=12 ORDER BY u.id DESC limit 10";echo preg_replace("/^(select ).+? (from .+?)(limit (\d{1,}(\,\d{1,})?))?$/i","\\1 count(*) \\2 limit 1;",$str);
[解决办法]
<?php

$str="SELECT u.id,u.name FROM user as u WHERE u.id=12 ORDER BY u.id DESC limit 1,10";
echo preg_replace("/^(select ).+ (from.+?)( limit [0-9\,]+){0,1}$/i","\\1 count(*) \\2 limit 1",$str);
echo "<br />";
$str="SELECT u.id,u.name FROM user as u WHERE u.id=12 ORDER BY u.id DESC";
echo preg_replace("/^(select ).+ (from.+?)( limit [0-9\,]+){0,1}$/i","\\1 count(*) \\2 limit 1",$str);
?>