帮小弟我看下这个正则

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Release： 2016-06-13 10:07:53

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帮我看下这个正则~

PHP code

<!--Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->$reg = "/(\d{2})\/\\1\/(\d{4})/";$text = '03/02/2009';

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为什么匹配不到呢？把正则改成"/(\d{2})\/(\d{2})\/(\d{4})/"就能匹配到了

------解决方案--------------------
这不是明摆的么？

02 能和 \1匹配么？
------解决方案--------------------
$text = '03/03/2009'; 这样估计就可以了。
------解决方案--------------------
因为在字符串中，你的\d匹配的是第一个 \d{2}也就是 03，\1反向引用也是03,在$text是找不到 03/03/2009 的。

如果改为$text='03/03/2009'; 就会匹配到了。

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