请问分页中的 (^|&) 这句正则是什么意思,看不明白-PHP Tutorial-php.cn

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请问分页中的 (^|&) 这句正则是什么意思,看不明白

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Jun 23, 2016 pm 01:43 PM

网上常见的通用分页函数:
其中这句正则是什么意思?
$url_query=ereg_replace("(^|&)page=$page","",$url_query);/

(^|&)
这句正则是意思:

^代表起始位置;或者在[^..]代表非;
|是或的意思;
------
(^|&)是^或& 还是什么? 另外网址中不可能出现^这个符号啊;为什么要替换^
即使要替换^也应该加个转义符吧;

回复讨论(解决方案)

^ 表示字符串开始
& 表示字符 &
^|& 表示从字符串开始或字符 & 开始

你的规则串期望能匹配到：
page=1
id=2& page=1

空或者&??，後跟page的??

http://www.example.com/?page=1
http://www.example.com/?action=list&page=1

少用正则表达式

空字条或 & 开头的匹配

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