not all characters removed
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[?i-s].*?music.*This was supposed to remove the whole line containing brackets and “music”. But in this case it doesn’t remove the D character in “Dialogue…”
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[?i-s].*?music.*The
[?i-s]is a character class matching the question mark or lowercase i through s. I think you meant(?i-s)to change mode to match case-insensitive with . not matching newline.
