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In web development, it is very common to display content in lists. When processing and parsing HTML files, regular expressions can be used to more easily match the corresponding content. This article will introduce how to match all lists in HTML using PHP regular expressions.
$html = file_get_contents('example.html');
ff6d136ddc5fdfeffaf53ff6ee95f185(.*?)929d1f5ca49e04fdcb27f9465b944689
to match all unordered lists. Among them, ? indicates that this match is non-greedy, and the matched content will be selected as small as possible, so that multiple lists will not be connected together for batch matching. The complete code is as follows: preg_match_all('/<ul>(.*?)</ul>/s', $html, $matches); foreach ($matches[0] as $key => $value) { echo $key . ': ' . $value . '<br>'; }
In the above code, the preg_match_all function can perform multiple matches and save the matching results to $matches. And /s means . matches all characters including newlines. Finally, use foreach to traverse and output the matching results.
preg_match_all('/<ol>(.*?)</ol>/s', $html, $matches); foreach ($matches[0] as $key => $value) { echo $key . ': ' . $value . '<br>'; }
Similarly, you can use the preg_match_all function to match and use foreach to output the results. .
preg_match_all('/<dl>(.*?)</dl>/s', $html, $matches); foreach ($matches[0] as $key => $value) { echo $key . ': ' . $value . '<br>'; }
Similarly, use the preg_match_all function to match, and use foreach to output the results.
The regular expression that matches all lists is: /04585a9939123efd3b029e4061973694(.*?)2f93380ee9d9196dac17b821a744d509/s
.
Among them, [ou] represents the character set, which means matching o or u. Use the preg_match_all function for matching, the code is as follows:
preg_match_all('/<[ou]l>(.*?)</[ou]l>/s', $html, $matches); foreach ($matches[0] as $key => $value) { echo $key . ': ' . $value . '<br>'; }
The above code will match all lists in HTML and output the matching results.
Summary
When processing HTML files, using regular expressions can match the corresponding content more conveniently and quickly. When matching HTML lists, you can match based on the tags of different types of lists. At the same time, you can also combine the matching methods of the three list types and use one regular expression to match all lists, which is more convenient.
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