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@ 2021-10-12T23:02:30Z

<?php

$strings = [
    'Rohlík 4,99 Kč 51235',
    'Rohlík CZK 4,99 51235',
    'Rohlík Kč4,99 51235',
    'Rohlík foo4,99 51235'
];

foreach ($strings as $string) {
    var_export(
        preg_match('/\b(?:(?:Kč|CZK) ?\K\d+(?:,\d+)?|\d+(?:,\d+)?(?= ?(?:Kč|CZK)))\b/u', $string, $m)
        ? $m[0]
        : 'not found'
    );
    echo "\n";
}

Output
Performance
VLD
References
Branches

preg_match: documentation ( source)
var_export: documentation ( source)

preferences:dark modelive previewkey bindings

27.12 ms | 405 KiB | 5 Q