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Home Backend Development PHP Tutorial PHP正则匹配的时候可以把一个长的字串视为一个原子处理吗,例如下面的这个

PHP正则匹配的时候可以把一个长的字串视为一个原子处理吗,例如下面的这个

Jun 23, 2016 pm 02:18 PM

(<blockquote><p>.*?<\/p><\/blockquote>)?
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我想匹配这一段内容,但是这段内容

.*?<\/p><\/blockquote> 可有可无。
但是后面加的?是针对原子的吧,表示0个或者1个原子,前面的不是一个原子而是一个字串。
怎么实现呢?


回复讨论(解决方案)

加个选择

(

.*?<\/p><\/blockquote>|.*)?

加个选择

(

.*?<\/p><\/blockquote>|.*)? 测试了下,报错了。

被括号括起了,不就是原子了吗?

被括号括起了,不就是原子了吗? 那为什么无法匹配到呢~~虽然可以先匹配到外面的大div,然后再第二次匹配。

不知道你要干什么?

不知道你要干什么?
我想匹配这段内容

<blockquote><p>中间是内容</p></blockquote>
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但是这段内容有可能有,有可能没有。就是这样。

这个意思?

preg_match_all('/(bb)?(c+)/', 'abbccc', $r);print_r($r);preg_match_all('/(bb)?(c+)/', 'abdccc', $r);print_r($r);
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这个意思?

preg_match_all('/(bb)?(c+)/', 'abbccc', $r);print_r($r);preg_match_all('/(bb)?(c+)/', 'abdccc', $r);print_r($r);
Copy after login
Copy after login
不是。说不清楚,先用别的办法解决吧。谢了。

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