XPath: How to find a node followed by an empty string?

Question

PHP

Hello!
You need to iterate over all nodes followed by an empty string or a string with whitespace characters.
I'm looking like this:

if( preg_match( '/^[\s\S]+$\r?\n[\s]+/miu', $element->c14n() ) ) {
    echo $element->c14n() . PHP_EOL;
}

does not find nodes with one empty line between them...
Or tell me how to find all empty lines BETWEEN nodes.
Thanks

Answer 1

so XPAth or Regexp ? Xpathu empty lines don't care