You can match and discard something that you don't want to replace. For example, match the group {{...}} and use the \K to replace only the right side, keeping the left side of \K as it is.

Code: 
$data =~ s<(?:{{.*?}}\K)?\n>{<br>\n}gs;
print $data;

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In reply to Re: Replace newlines only if not inside braces by trizen
in thread Replace newlines only if not inside braces by jbryan

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