[Bug 5078] New: sed mishandles \`

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=5078

           Summary: sed mishandles \`
           Product: Busybox
           Version: 1.19.x
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: minor
          Priority: P5
         Component: Other
        AssignedTo: unassigned at busybox.net
        ReportedBy: dubiousjim at gmail.com
                CC: busybox-cvs at busybox.net
   Estimated Hours: 0.0


BusyBox 1.19.3, built against uClibc 0.9.32, on i686 Linux


The Gnu regex extensions \` and \' work properly in busybox grep:

# printf 'abc\ndef' | grep -oz '\`[a-f].' | od -cAn
   a   b  \0

# printf 'abc\ndef' | grep -oz '.[a-f]\'\' | od -cAn
   e   f  \0

So it looks like uClibc is handling them properly. And \' also seems to work
right with BusyBox sed:

# printf 'abc\ndef' | sed -n 'N; s/.[a-f]\'\''/=&=/gp'; echo
abc
d=ef=

but there's something wrong with sed's handling of \`:

# printf 'abc\ndef' | sed -n 'N; s/\`[a-f]./=&=/gp'; echo
=ab==c
==de=f

Expected output:
=ab=c
def

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