Try this code
function wrap_heading_with_div( $content ) {
$heading = '/<h\d.*?>(.*?)<\/h\d>/ims';
$wrapper="<div class="title">$0</div>";
$content = preg_replace($heading, $wrapper, $content);
return $content;
}
add_filter( 'the_content', 'wrap_heading_with_div' );
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