How can preg_match_all be used to parse HTML files in PHP?

To parse HTML files in PHP using preg_match_all, you can use regular expressions to extract specific content from the HTML file. This function allows you to search for multiple occurrences of a pattern within a string and store the results in an array. By using preg_match_all with the appropriate regular expression pattern, you can effectively extract the desired information from the HTML file. 

$html = file_get_contents('example.html'); // Get the HTML content from a file
$pattern = '/<h1>(.*?)<\/h1>/'; // Regular expression pattern to match h1 tags
preg_match_all($pattern, $html, $matches); // Perform the match

// Output the matched content
foreach($matches[1] as $match){
    echo $match . "<br>";
}

Keywords

preg_match_all HTML files parsing PHP regular expressions

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