Works as long as }} is immediately followed by a \newline! ¹

Is there a reason why you've put the \K within the group?

I suppose this does the same and is better readable!

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

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Cheers Rolf

1) see or clause in Re: Replace newlines only if not inside braces for a work around

In reply to Re^2: Replace newlines only if not inside braces by LanX
in thread Replace newlines only if not inside braces by jbryan

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