How to configure the parser to unload several numbers from the page?

Question

PHP

Good afternoon. There is a parser

<?php
    $content = file_get_contents('http://95.31.11.93:82/');
    $pos = strpos($content, 'Давление');
    $content = substr($content, $pos);
    $pos = strpos($content, 'mm');
    $content = substr($content, 8, $pos);
    echo $content;
    ?>

problemma when parsing with the link specified in the code, the parser displays:
748.0mm Влажand should display "748.0"
Help solve this problem.

Answer 1

$data = file_get_contents('http://95.31.11.93:82/');
preg_match('#Давление\s+([\d\.]+)mm#Uis', $data, $out);
echo $out[1];