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Reg expression to remove empty Tags (any of them)?

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醉酒成梦
醉酒成梦 2020-12-18 17:21

I like to remove any empty html tag which is empty or containing spaces.

something like to get:

$string = \"text&
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3条回答
  • 醉酒成梦
    2020-12-18 17:29 
    function stripEmptyTags ($result)
{
    $regexps = array (
    '~<(\w+)\b[^\>]*>\s*</\\1>~',
    '~<\w+\s*/>~'
    );

    do
    {
        $string = $result;
        $result = preg_replace ($regexps, '', $string);
    }
    while ($result != $string);

    return $result;
}


$string = "<b>text</b><b><span> </span></b><p>  <br/></p><b></b><font size='4'></font>";
echo stripEmptyTags ($string);
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  • 一生所求
    2020-12-18 17:33

    You will need to run the code multiple times in order to do this only with regular expressions.

    the regex that does this is: 

    /<(?:(\w+)(?: [^>]*)?`> *<\/$1>)|(?:<\w+(?: [^>]*)?\/>)/g

    But for example on your string you have to run it at least twice. Once it will remove the <br/> and the second time will remove the remaining <p> </p>.

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  • 闹比i
    2020-12-18 17:35

    Here is an approach with DOM:

    // init the document
$dom = new DOMDocument;
$dom->loadHTML($string);

// fetch all the wanted nodes
$xp = new DOMXPath($dom);
foreach($xp->query('//*[not(node()) or normalize-space() = ""]') as $node) {
    $node->parentNode->removeChild($node);
}

// output the cleaned markup
echo $dom->saveXml(
    $dom->getElementsByTagName('body')->item(0)
);

    This would output something like

    <body><b>text</b></body>

    XML documents require a root element, so there is no way to omit that. You can str_replace it though. The above can handle broken HTML.

    If you want to selectively remove specific nodes, adjust the XPath query.

    Also see

    • How do you parse and process HTML/XML in PHP?
    • Locating the node by value containing whitespaces using XPath
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