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这个如果用mysql语句来替换，请问要怎么写？

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Jun 23, 2016 pm 01:45 PM

我的问题：
求一个网址截取的正则替换表达式

http://p.yiqifa.com/n?k=2mLErnws6E4H2mLErI6H2mLsWN3OrnDsWN2e6QLs1NDF6ZLErZyH2mLe6n6w3E3LMZqt6cuLUJeH&spm=1.1.1.1&t=http://www.xuansou.com/

这样一个网址，想把第二个http://前面的内容全部替换成空
也就是只想保留http://www.xuansou.com/

需要怎么弄，谢谢，我是菜鸟
jordan102版主的正确回答我已经结帖了：
$s = 'http://p.yiqifa.com/n?k=2mLErnws6E4H2mLErI6H2mLsWN3OrnDsWN2e6QLs1NDF6ZLErZyH2mLe6n6w3E3LMZqt6cuLUJeH&spm=1.1.1.1&t=http://www.xuansou.com/';
echo preg_replace('/.+?t=/', '', $s);

以上是用于php代码的，
这个如果用mysql语句来替换，请问要怎么写？

回复讨论(解决方案)

截取出来就是了
SUBSTRING_INDEX(字段名, 't=', -1)

update alibaba_site set url = replace(url,SUBSTRING_INDEX(url,'t=',-1),'') where id=2452
这样的话整个字段的值全部玩完了

update ylmf_site set url = SUBSTRING_INDEX(url,'url=',-1) where id=2452
试了这样是可以的，不过有个问题
就是最后一个网址的前面那些字符串是变化多端的
每替换一批都要修改一次

'前面那些字符串' 是指哪些？

这个最好用php处理，mysql不支持复杂的正则写法，如果觉得存储在字段的值，不满足自己，可以php写个正则替换脚本执行。

'前面那些字符串' 是指哪些？

网址1：http://click.linktech.cn/?m=idaphne&a=A100113464&l=99999&l_cd1=0&l_cd2=1&u_id=88819&tu=http%3A%2F%2Fwww.xuansou.com%2F
网址2：http://p.yiqifa.com/n?k=2mLErnws6E4H2mLErI6H2mLsWN3OrnDsWN2e6QLs1NDF6ZLErZyH2mLe6n6w3E3LMZqt6cuLUJeH&spm=1.1.1.1&t=http://www.xuansou.com/
这二个网址中的http://www.xuansou.com的前面就是指 “'前面那些字符串' ”

怕种mysql正则好实现不，如果不好实现，用您的那个xxxx_index也是可以的，虽然麻烦了一点

update ylmf_site set url = concat('http', SUBSTRING_INDEX(url,'=http',-1)) where id=2452

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