Ok, now the requirements are a lot clearer,
for the mentioned samples, the following pattern might work:

(https://psv4\.website\.net/c\d+/u\d+/)[0-9a-z]+/(audios/[0-9a-z]+)/index\.m3u8(
\?extra=.*?\.)m3u8

replace with

$1$2.mp3$3mp3

(Asuming, there are no other cornercases, or lacking specification - e.g. the
duplicated .mp3 in the first example looks strange.)

hth,
   vbr

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