PHP正则表达式匹配，匹配所有以数字开头的行，后跟句点

问题描述：

I used simple_html_dom, to parse some HTML and have the following HTML Table that in an array called $pre

Now, how can I use PHP regex to get only the lines that match the result below?

<table>
    <tr>
        <td>
            <pre>1.   APEAL/890/2010     HUSSAIN ISMAIL SATWILKAR        SHRI C.K. PENDSE</pre>
        </td>
    </tr>
    <tr>
        <td>
            <pre>     [Criminal]                                         MS.ROHINI DANDEKAR ADV.AP</pre>
        </td>
    </tr>
    <tr>
        <td>
            <pre>                        V/S THE STATE OF MAHARASH       PTD AS PER CTS ORD 7/9/17</pre>
        </td>
    </tr>
    <tr>
        <td>
            <pre>                        TRA                             P.P.FOR  P. P</pre>
        </td>
    </tr>
    <tr>
        <td>
            <pre></pre>
        </td>
    </tr>
    <tr>
        <td>
            <pre>        REMARK : (By Accused against Conviction) Note: (1) Matter is Ready for final</pre>
        </td>
    </tr>
    <tr>
        <td>
            <pre>                 hearing. (2) Accd. is in jail. (3) R & P with PB received. (4)</pre>
        </td>
    </tr>
    <tr>
        <td>
            <pre>                 Muddemal article are to be called for. (5) Report received from</pre>
        </td>
    </tr>
    <tr>
        <td>
            <pre>                 Nashik Central Prison stated therein that "Orig. accd. death dated</pre>
        </td>
    </tr>
    <tr>
        <td>
            <pre>                 20/11/2015 (Report kept at flag "A") . ....... Court (DB) for final</pre>
        </td>
    </tr>
    <tr>
        <td>
            <pre>                 hearing.</pre>
        </td>
    </tr>
    <tr>
        <td>
            <pre></pre>
        </td>
    </tr>
    <tr>
        <td>
            <pre></pre>
        </td>
    </tr>
    <tr>
        <td>
            <pre></pre>
        </td>
    </tr>
    <tr>
        <td>
            <pre>2.   APEAL/966/2011     ABDUL MALIK SHAIKH              SHRI S. R. MITHARE</pre>
        </td>
    </tr>
    <tr>
        <td>
            <pre>     [Criminal]</pre>
        </td>
    </tr>
    <tr>
        <td>
            <pre>                        V/S THE STATE OF MAHARASH</pre>
        </td>
    </tr>
    <tr>
        <td>
            <pre>                        TRA</pre>
        </td>
    </tr>
    <tr>
        <td>
            <pre></pre>
        </td>
    </tr>
    <tr>
        <td>
            <pre>        REMARK : (By Accused Against Conviction) Note:- (1) Matter is ready for</pre>
        </td>
    </tr>
    <tr>
        <td>
            <pre>                 Final Hearing. (2) Original Accused is in Jail. (3) R & P received</pre>
        </td>
    </tr>
    <tr>
        <td>
            <pre>                 with PaperBooks. (4) Muddemal Articles are to be called for. (5)</pre>
        </td>
    </tr>
    <tr>
        <td>
            <pre>                 Report received from Kolhapur central Prison stated therein that</pre>
        </td>
    </tr>
    <tr>
        <td>
            <pre>                 "Orig. Accused expired on 19/04/2015 (Report kept at flag "A")</pre>
        </td>
    </tr>
    <tr>
        <td>
            <pre>                 - Court D.B. for Final Hearing.</pre>
        </td>
    </tr>
    <tr>
        <td>
            <pre></pre>
        </td>
    </tr>
    <tr>
        <td>
            <pre></pre>
        </td>
    </tr>
    <tr>
        <td>
            <pre></pre>
        </td>
    </tr>
    <tr>
        <td>
            <pre>3.   APEAL/486/2012     AJAY SITARAM BHARATI            MISS. TANU KHATTRI</pre>
        </td>
    </tr>
    <tr>
        <td>
            <pre>     [Criminal]</pre>
        </td>
    </tr>
</table>

Result after using Regex:

<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>

Using this code: preg_match('^\<pre\>\d2*\./gm', $pre[$i]) returns: preg_match(): No ending delimiter '^' found

This looks like the correct regex to use, this is from 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)

答

The php preg_* functions require a delimiter - a symbol that is not used within the pattern.

Also, your pattern won't match correctly. The reason for this is that ^ matches the very start of the line. And the pre tag doesn't start for a few tabs.

This regex will match any pre tag that is on the same line, that starts with at least one number (for example, 1, 16, 256, etc) and a period.

preg_match('#(<pre>\d+\..*</pre>)#', $pre[$1], $matches);
vaR_dump($matches);

In this example, I've used # as the delimiter.

答

Here's what you need:

#<pre>(?<line>\d+\..+)<\/pre>#

Obviously you know what pre is. The brackets denote a capture group, which I have named 'line', by putting ?<line> in the brackets.

Then it looks for a number \d+\, a literal dot \., anything .+ followed by the closing tag.

$regex = '#<pre>(?<line>\d+\..+)<\/pre>#';

preg_match_all($regex, $html, $matches);

foreach($matches['line'] as $line) {
    echo $line ."
";
}

Output:

1. APEAL/890/2010 HUSSAIN ISMAIL SATWILKAR SHRI C.K. PENDSE 
2. APEAL/966/2011 ABDUL MALIK SHAIKH SHRI S. R. MITHARE

Here it is in action: https://regex101.com/r/6U8S9C/1

And again running in php: https://3v4l.org/QoVsY

PHP正则表达式匹配，匹配所有以数字开头的行，后跟句点

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