Canon Cat Reference Manual page 23

Cursor Rebound When the Pattern
is
Not Found
The Cat
does not treat
a
failed
leap
as
an
error.
The
cursor
simply returns to its starting
point
the instant there is no
match between the leap pattern and the
text.
After
the
cursor rebounds
you
can
let go and start the leap over, or
you can
erase some
or all of the pattern
(see Erasing and
Correcting the Leap
Pattern below).
Because
the
most
common error in leaping is
repeatedly
pressing the
same
key to leap
from
example to example
of
the
same
thing, the Cat
beeps
when the leap
pattern
consists
ofthree
or
more identical
characters that
cannot be
found
in
the text.
Erasing and Correcting the Leap Pattern
If
you press
[ERASEI
during
a
leap,
it
erases
the
last
character
you
typed
in
the leap
pattem.
The cursor back-
tracks, behaving
as
ifit
had leaped
only
as
far
as
indicated
by
the shortened
pattern.
When you
erase
all
characters
from
a
pattern,
the cursor returns to its starting place.
You can type a
corrected
or entirely new pattern after
erasing
part or all
of
a
pattem.
Pattern Memory
The last
pattem
used
in
a
leap remains
in the
Cat's
memory
until you
leap
to
something
new. This
means
you
can let
go of
a
LEAP
key, then
later
use
[LEAP
AGAIN]
to leap to
the next example of what you
just
leaped
to.
[LEAP
AGATN]
is
described
below.
The LEAP AGAIN Command
[LEAP
AGAIN]
causes
the cursor
to
leap again
-
in
the
direction
indicated
by the LEAP key
-
to the
nearest
occurrence
of the last pattern
used
in
a
leap. You
use
the
command repeatedly
to
find all
instances of
a
pattem
in the
text.
The cursor circles the entire text, crossing
the
boundary between the top
and
bottom
of
the text,
and
finally returns to the exact spot
it
started
from.
Like
leaping,
[LEAP
AGATN]
can go forward
or
backward.
To
leap again,
hold
a
LEAP
key and press
[USE FRONT],
or
hold
[USE
FRONT]
and
press
a
LEAP key. The first
method
is most convenient and most often
used.
If
you
press and
hold
[USE
FRONT]
and the
LEAP
key
together,
[LEAP AGAIN] autorepeats, causing the cursor
to
skitter
rapidly
through
the
text.