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回复讨论(解决方案)
Home Backend Development PHP Tutorial 谁帮改个正则?

谁帮改个正则?

Jun 23, 2016 pm 02:16 PM

这是要匹配的内容:

 

<dl>	<dt>2013</dt>	<dd>row1</dd>	<dd>row2</dd>	<dd>row3</dd></dl><dl>	<dt>2014</dt>	<dd>row1</dd>	<dd>row2</dd></dl>
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要匹配dl,并且匹配dl下的dt,和所有的dd,

我是这样写的:

<dl>\s+<dt>(.*?)</dt>(\s+<dd>(.*?)</dd>\s+)*?</dl>
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但是这个匹配出的结果不太对,dd始终只匹配到了最后一个。这个表达式应该怎么修改呢?


回复讨论(解决方案)

$s =<<< HTML<dl>    <dt>2013</dt>    <dd>row1</dd>    <dd>row2</dd>    <dd>row3</dd></dl><dl>    <dt>2014</dt>    <dd>row1</dd>    <dd>row2</dd></dl>HTML;preg_match_all('#<dl>.+</dl>#isU', $s, $r);print_r($r);
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Copy after login
Array
(
[0] => Array
(
[0] =>

2013

row1

row2

row3


[1] =>

2014

row1

row2


)

)



$s =<<< HTML<dl>    <dt>2013</dt>    <dd>row1</dd>    <dd>row2</dd>    <dd>row3</dd></dl><dl>    <dt>2014</dt>    <dd>row1</dd>    <dd>row2</dd></dl>HTML;preg_match_all('#<dl>.+</dl>#isU', $s, $r);print_r($r);
Copy after login
Copy after login
Array
(
[0] => Array
(
[0] =>

2013

row1

row2

row3


[1] =>

2014

row1

row2


)

)
谢谢版主。不过这样的我可以写出来,我还需要匹配dt,和dd,dt和dd里面的东西需要匹配出来

分开匹配吧,dl 匹配一次,里面的dt和dd再匹配一次。

变通一下(待匹配的项数不定,形式语言基本无法实现)

preg_match_all('#<(d[dt])>\s*([^<]+)</\\1>#is', $s, $r);print_r($r);
Copy after login
Copy after login
Array
(
[0] => Array
(
[0] =>
2013

[1] =>
row1

[2] =>
row2

[3] =>
row3

[4] =>
2014

[5] =>
row1

[6] =>
row2

)

[1] => Array
(
[0] => dt
[1] => dd
[2] => dd
[3] => dd
[4] => dt
[5] => dd
[6] => dd
)

[2] => Array
(
[0] => 2013
[1] => row1
[2] => row2
[3] => row3
[4] => 2014
[5] => row1
[6] => row2
)

)

这个你要一个正则式没办法实现的,要么就像xuzuning说的那样去做了,只是那样去作无法分清楚哪些是dt的,那些是dd的

因为相同分组会自动覆盖,要么想版主全匹配要么就是分开2次匹配。

变通一下(待匹配的项数不定,形式语言基本无法实现)

preg_match_all('#<(d[dt])>\s*([^<]+)</\\1>#is', $s, $r);print_r($r);
Copy after login
Copy after login
Array
(
[0] => Array
(
[0] =>
2013

[1] =>
row1

[2] =>
row2

[3] =>
row3

[4] =>
2014

[5] =>
row1

[6] =>
row2

)

[1] => Array
(
[0] => dt
[1] => dd
[2] => dd
[3] => dd
[4] => dt
[5] => dd
[6] => dd
)

[2] => Array
(
[0] => 2013
[1] => row1
[2] => row2
[3] => row3
[4] => 2014
[5] => row1
[6] => row2
)

)

谢谢版主啦。解决问题了,不过改用的是dom,

不过请版主解释一下你那个表达式呗

<(d[dt])>\s*([^<]+)</\\1>
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这个\\1>不是太懂哦,谢谢

\s*([^
这就是向后引用

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