Manipulating Null Characters in Text

[cca!z]

CCA EMACS now allows the specification of the null character (^@) in search
strings (both incremental and nonincremental) and in query replace strings
(both the From: and To: fields). This new feature is in addition to the
already existing capability of including null characters both in the buffer
and in killed regions. To my knowledge, this makes CCA EMACS the only
editor on Unix which is fully capable of handling null characters just
like any other character.

In conjunction with this feature, the C-Q command for quoting characters
has been made more versatile. From now on, if the C-Q command is followed
by a digit, it will expect two more digits, and it will enter into the
buffer the character represented by the octal number formed by the three
digits. An argument to the C-Q command is now taken as a repeat count.
The convention of typing octal digits after the C-Q can be used wherever
C-Q is allowed, such as when you are entering search or replace strings
at the bottom of the screen.