我使用simple_html_dom来解析一些HTML，并在一个名为$pre的数组中包含以下HTML表
现在，我如何使用PHP正则表达式只获得与下面结果匹配的行？
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<pre>1. APEAL/890/2010 HUSSAIN ISMAIL SATWILKAR SHRI C.K. PENDSE</pre>
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<pre> [Criminal] MS.ROHINI DANDEKAR ADV.AP</pre>
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<pre> V/S THE STATE OF MAHARASH PTD AS PER CTS ORD 7/9/17</pre>
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<pre> TRA P.P.FOR P. P</pre>
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<pre></pre>
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<pre> REMARK : (By Accused against Conviction) Note: (1) Matter is Ready for final</pre>
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<pre> hearing. (2) Accd. is in jail. (3) R & P with PB received. (4)</pre>
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<pre> Muddemal article are to be called for. (5) Report received from</pre>
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<pre> Nashik Central Prison stated therein that "Orig. accd. death dated</pre>
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<pre> 20/11/2015 (Report kept at flag "A") . ....... Court (DB) for final</pre>
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<pre> hearing.</pre>
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<pre></pre>
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<pre></pre>
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<pre></pre>
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<pre>2. APEAL/966/2011 ABDUL MALIK SHAIKH SHRI S. R. MITHARE</pre>
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<pre> [Criminal]</pre>
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<pre> V/S THE STATE OF MAHARASH</pre>
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<pre> TRA</pre>
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<pre></pre>
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<pre> REMARK : (By Accused Against Conviction) Note:- (1) Matter is ready for</pre>
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<pre> Final Hearing. (2) Original Accused is in Jail. (3) R & P received</pre>
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<pre> with PaperBooks. (4) Muddemal Articles are to be called for. (5)</pre>
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<pre> Report received from Kolhapur central Prison stated therein that</pre>
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<pre> "Orig. Accused expired on 19/04/2015 (Report kept at flag "A")</pre>
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<pre> - Court D.B. for Final Hearing.</pre>
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<pre></pre>
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<pre></pre>
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<pre></pre>
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<pre>3. APEAL/486/2012 AJAY SITARAM BHARATI MISS. TANU KHATTRI</pre>
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<pre> [Criminal]</pre>
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使用正则表达式后的结果：
<pre>1. APEAL/890/2010 HUSSAIN ISMAIL SATWILKAR SHRI C.K. PENDSE</pre>
<pre>2. APEAL/966/2011 ABDUL MALIK SHAIKH SHRI S. R. MITHARE</pre>
<pre>3. APEAL/486/2012 AJAY SITARAM BHARATI MISS. TANU KHATTRI</pre>
使用此代码：preg_match('^\<pre\>\d2*\./gm', $pre[$i])返回：preg_match(): No ending delimiter '^' found
这看起来像正确的正则表达式，这是来自regex101：
^ asserts position at start of the string
\< matches the character < literally (case sensitive)
pre matches the characters pre literally (case sensitive)
\> matches the character > literally (case sensitive)
\d matches a digit (equal to [0-9])
2* matches the character 2 literally (case sensitive)
* Quantifier — Matches between zero and unlimited times, as many times as possible, giving back as needed (greedy)
\. matches the character . literally (case sensitive)
Global pattern flags
g modifier: global. All matches (don't return after first match)
php preg_*函数需要一个分隔符 - 一个未在模式中使用的符号。
此外，您的模式将无法正确匹配。原因是^匹配线的开头。并且pre标签不会针对几个标签启动。
此正则表达式将匹配同一行上的任何pre标记，该标记以至少一个数字（例如，1,16,256等）和句点开头。
preg_match('#(<pre>\d+\..*</pre>)#', $pre[$1], $matches);
vaR_dump($matches);
在这个例子中，我使用#作为分隔符。
这就是你需要的：
#<pre>(?<line>\d+\..+)<\/pre>#
显然你知道pre是什么。括号表示一个捕获组，我将其命名为“line”，将?<line>放在括号中。
然后它寻找一个数字\d+\，一个字面点\.，任何.+，然后是结束标记。
$regex = '#<pre>(?<line>\d+\..+)<\/pre>#';
preg_match_all($regex, $html, $matches);
foreach($matches['line'] as $line) {
echo $line ."\n";
}
输出：
1. APEAL/890/2010 HUSSAIN ISMAIL SATWILKAR SHRI C.K. PENDSE
2. APEAL/966/2011 ABDUL MALIK SHAIKH SHRI S. R. MITHARE
在这里它是行动：https://regex101.com/r/6U8S9C/1
再次运行在php：https://3v4l.org/QoVsY