Need help extracting meta title from an URL using curl and DOM - php

Question

I need to extract the dollar amount e.g. $594 from the meta title of an URL. I am getting full meta title however i just need the $594 from it not the whole title. Here is my code. Thanks
<?php
// Web page URL
$url = 'https://www.cheapflights.com.au/flights-to-Delhi/Sydney/';
// Extract HTML using curl
$ch = curl_init();
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
$data = curl_exec($ch);
curl_close($ch);
// Load HTML to DOM object
$dom = new DOMDocument();
#$dom->loadHTML($data);
// Parse DOM to get Title data
$nodes = $dom->getElementsByTagName('title');
$title = $nodes->item(0)->nodeValue;
// Parse DOM to get meta data
$metas = $dom->getElementsByTagName('meta');
$description = $keywords = '';
for($i=0; $i<$metas->length; $i++){
$meta = $metas->item($i);
if($meta->getAttribute('name') == 'description'){
$description = $meta->getAttribute('content');
}
if($meta->getAttribute('name') == 'keywords'){
$keywords = $meta->getAttribute('content');
}
}
echo "$title". '<br/>';
?>