CODEWITHSUNDEEP
phphtmlxmlregexsvg
CaribouCode
CaribouCode

Reputation: 14438

match next regex pattern after another pattern

I want to match the NEXT occurrence of '/</\g>/' after every '/<g>/'.

I'm trying to use this in a PHP preg_replace to remove any group tags <g> that have no id. I cannot select every closing group tag because I'm not removing all group tags.

For example:

<g id="someid">
  <g>
    <!--content-->
  </g>
</g>

In the above example, the opening group tag needs to be kept, and so does the last </g> that will close the opening tag. The group tag (opening and close) in between needs to go, but not the content inside it.

Upvotes: 0

Views: 54

Answers (2)

anubhava
anubhava

Reputation: 786291

Better to use DOM parser for this deletion:

$xml = '<g id="someID">
  <g>
    <path d="..." />
  </g>
</g>';
$doc = new DOMDocument();
libxml_use_internal_errors(true);
$doc->loadXML($xml); // loads your xml
$xpath = new DOMXPath($doc);
$nlist = $xpath->query("//g[not(@id)]"); // g tag without @id

$numnodes = $nlist->length;
for($i=0; $i < $numnodes; $i++) {
   $node = $nlist->item($i);
   $node->parentNode->removeChild($node);
}

$newXML =  $doc->saveXML();
echo $newXML;

OUTPUT:

<g id="someID">
</g>

Upvotes: 2

Mike Monteith
Mike Monteith

Reputation: 541

It would be better to use a HTML parser instead of regex to do this kind of operation. Is there a good reason why you're using preg_replace?

Upvotes: 0

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