request_body capture regex

[Musta Fa]

is it possible to capture POST data, but as soon there is a "password" then
this word and its value to mask or exclude from log.

i was trying to split request_body, but it not working correct:

map $request_body $request_body_nopwd {
"~(.*)(&|%5B)password(%5D)?\=" $1;
}

also if request dont have password it returns empty value, etc
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