PHP regexp parse HTML

问题

My regexp:

<([a-zA-Z0-9]+)>[\na-zA-Z0-9]*<\/\1+>

my string:

<div>
<f>
</f>
</div>

the result is:

array(2
  0 =>  array(1
  0 =>  <f>
</f>
)
1   =>  array(1
0   =>  f
)
)

why it is capturing <f></f>, and ignoring the first <div> ?

回答1:

The answer is USE A PARSER INSTEAD (sorry for my shouting). While it is sometimes faster to use a regular expression to obtain an ID or URL string, html tags need a rather error-prone way of understanding via regex. Consider the following code, isn't that much more beautiful than druidic characters with special meanings?

<?php
$str = "
<container>
    <div class='someclass' data='somedata'>
        <f>some content here</f>
    </div>
</container>";
$xml = simplexml_load_string($str);

echo $xml->div->f; // some content here
$attributes = $xml->div->attributes();
print_r($attributes); // class and data as keys
?>

回答2:

I'd say it's because your second character class statement tries to find 0 or more of the characters before the ending tag comes, and that doesn't match with the <div>...</div> block.

来源：https://stackoverflow.com/questions/34252497/php-regexp-parse-html