How Can I Find The Contents Of The First H3 Tag?

January 20, 2023 Post a Comment

I am looking for a regex to find the contents of the first

tag. What can I use there?

Solution 1:

You should use php's DOM parser instead of regular expressions. You're looking for something like this (untested code warning):

$domd = new DOMDocument();
libxml_use_internal_errors(true);
$domd->loadHTML($html_content);
libxml_use_internal_errors(false);

$domx = new DOMXPath($domd);
$items = $domx->query("//h3[position() = 1]");

echo $items->item(0)->textContent;

Solution 2:

Well, a simple solution would be the following:

preg_match( '#<h3[^>]*>(.*?)</h3>#i', $text, $match );
echo $match[1];

For everything more complex, you should consider using a HTML document parser though.

Solution 3:

The DOM approach:

<?php

$html = '<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head><title></title>
</head>
<body>

<h1>Lorem ipsum<h1>
<h2>Dolor sit amet<h2>
<h3>Duis quis velit est<h3>
<p>Cras non tempor est.</p>
<p>Maecenas nec libero leo.</p>
<h3>Nulla eu ligula est</h3>
<p>Suspendisse potenti.</p>

</body>
</html>
';

$doc = new DOMDocument;
$doc->loadHTML($html);

$titles = $doc->getElementsByTagName('h3');
if( !is_null($titles->item(0)) ){
    echo $titles->item(0)->nodeValue;
}

?>

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Solution 4:

Here's an explanation why parsing HTML with regular expressions is evil. Anyway, this is a way to do it...

$doc = new DOMDocument();
$doc->loadHTML($text);
$headings = $doc->getElementsByTagName('h3');
$heading = $headings->item(0);
$heading_value = (isset($heading->nodeValue)) ? $heading->nodeValue : 'Header not found';

Solution 5:

First of all: regular expressions aren't a proper tool for parsing HTML code. However in this case, they should be good enough, cause H3 tags cannot be nested.

preg_match_all('/<h3[^>]*>(.*?)<\/h3>/si', $source, $matches);

$matches variable should contains content from H3 tagas.

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