[Dovecot] [solved] mbox: extra linefeed after Content-Length header in 1.1.rc8

Diego Liziero diegoliz at gmail.com
Thu Jun 5 11:45:23 EEST 2008

> On Wed, 2008-06-04 at 23:59 +0200, Diego Liziero wrote:
> As the extra linefeed is between Content-Length and Subject headers,
> I'm thinking about using a regexp based replace such as
> s/(Content-Length: [0-9]+)\n\n(Subject: )/$1\n$2/s
> but I can't find how to make multiple lines matching work.
> Any suggestion?

Thank you everyone for your help.
After some quick tries, and following your suggestions, I ended up in
writing a silly perl script that matched one by one each of the three
lines and printed only the first and third one.

On Thu, Jun 5, 2008 at 12:07 AM, Timo Sirainen <tss at iki.fi> wrote:
> Perl maybe? Something like (not tested):
> perl -pe 'BEGIN { $/ = ""; } s/^(Content-Length: [0-9]+)\n\n(Subject: )/$1\n$2/g' < mbox > mbox2
> $/ changes the line separator.

Almost right. But this deletes all empty lines, not just the ones in
the header. I didn't try to have a deeper look.

On Thu, Jun 5, 2008 at 8:16 AM,  <tomas at tuxteam.de> wrote:
> That would be the s modifier for a Perl regexp (treat string as a single
> line):
>  $x =~ /.../s

This should be the right way.. see below.

On Thu, Jun 5, 2008 at 12:03 AM, Asheesh Laroia <asheesh at asheesh.org> wrote:
>Python has an re.MULTILINE option you can pass to the regular expression so that it can cross lines.  Perhaps Perl >or your favorite regular expression toolkit has something similar?

Yes, but with perl I didn't find quickly a solution to read multiple
lines from a file without filling all system memory when files are
some gigabytes big.


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