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@ 2020-11-22T11:59:03Z

<?php

$strs= ["discount of €50,20 on these items","This item on sale now for €30,20"];
foreach ($strs as $s){
    if (preg_match('~(?<!\bfor\s)€(\d+(?:,\d+)?)~', $s, $m)) {
        echo $m[1].PHP_EOL;
    } else {
        echo "No match!";
    }
}

Output
Performance
VLD
References
Branches

preg_match: documentation ( source)

preferences:dark modelive previewkey bindings

25.86 ms | 404 KiB | 5 Q