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Re^3: Removing double carriage return

by Cristoforo (Deacon)
on Aug 23, 2011 at 04:58 UTC ( #921824=note: print w/ replies, xml ) Need Help??

in reply to Re^2: Removing double carriage return
in thread Removing double carriage return

From the command line, this replaces 3 or more newlines with 2 newlines or replaces exactly 2 newlines with 1 newline.

perl -i.bak -0777 -pe 's/(\n{3,}|\n\n)/2 == length $1 ? "\n" : "\n\n"/eg' inputfile

Notice that this looks for the longest match first (so that 2 newlines won't match more than 2, i.e. 3 or more).

Update: That could be simplified to:

perl -i.bak -0777 -pe 's/\n+/2 < length $& ? "\n\n" : "\n"/ge' inputfile

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Re^4: Removing double carriage return
by dragooneye (Novice) on Aug 26, 2011 at 17:29 UTC
    Sorry for the late reply. Thanks Cristoforo for the one liner solution. I'll need to read up on the slurp switch. I hope that this will help others.

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