Problem getting first $_get var in request url

hi, could someone please tell me how can I get value of first var from request url in rewrite rules?

For examlpe I’ve url like this:
https://10.100.5.179/szukaj/?s=text&v1=value

and I’m adding a rewrite rule using “search_rewrite_rules” hook:
…
$new_array[‘szukaj/(\?)s=(.+)$’] = ‘index.php?s=$matches[2]’;
…

I want to get the “text”.

This regexp ‘szukaj/(\?)s=(.+)$’ gives fine results when testing here:
but when I test it in Rewrite Analyzer plugin it gives no matches.

Please help.