<?php

$regex = "([\d\.]+\|[\d\.]+)";
$value = str_replace(",", ".", "|5,50|7,00|| |10,0|2,00|| |3,00|30,0||");

preg_match_all("/{$regex}/", $value, $results);

foreach(reset($results) as $result) {
    $values = explode("|", $result);

    var_dump(sprintf("%s = %s", implode(" + ", $values), array_sum($values)));
}