I fear, it still wasn't as understandable as was needed.
The samples are not quite consistent , but if you needed to remove the DELETE/
part, the pattern might be
(https://psv4\.website\.net/c\d+/u\d+/)DELETE/(audios/[0-9a-z]+\.mp3\?extra=.*?\
.mp3)

replace with:
$1$2

if more replacements or deletions are needed, put more parenthesised groups to
the pattern (and to the replacement as well $3 etc.

(Also the question mark ? needs to be escaped as \? , on the other hand the
slash shouldn't need escaping, but sometimes it might be appropriate too, e.g.
in javascript source.) 


hth,
   vbr

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