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一段PHP正则的不解,该如何解决

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Release: 2016-06-13 13:33:36
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一段PHP正则的不解

PHP code
<!--

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-->
$zz2="/\/is";
$text=preg_replace($zz2,"",$text);

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阅读这段"去掉图片链接"的PHP代码,
下面是对代码的一些不解:
1. 开头处 \2.后面已经有is指明不区分大小写了,前面还有必要用组合来区分(a|A)大小写吗?

------解决方案--------------------
这段正则写的太过冗长,你的理解是正确的
------解决方案--------------------
1: 加与不加都可以。
2:没有必要了。写一个即可。
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