useless.) But it does not call @code{search-forward} right away. First
it checks the next input character to see if is @kbd{C-w},
which specifies a word search.
-@ifinfo
+@ifnottex
@xref{Word Search}.
-@end ifinfo
+@end ifnottex
@kbd{C-r @key{RET}} does likewise, for a reverse incremental search.
@findex search-forward
should not quote these characters when they have no special meaning
either. This would not clarify anything, since backslashes can
legitimately precede these characters where they @emph{have} special
-meaning, as in @code{[^\]} (@code{"[^\\]"} for Lisp string syntax),
+meaning, as in @samp{[^\]} (@code{"[^\\]"} for Lisp string syntax),
which matches any single character except a backslash.
@node Regexp Backslash
the numbering of the groups that are meant to be referred to.
@item \@var{d}
+@cindex back reference, in regexp
matches the same text that matched the @var{d}th occurrence of a
-@samp{\( @dots{} \)} construct.
+@samp{\( @dots{} \)} construct. This is called a @dfn{back
+reference}.
After the end of a @samp{\( @dots{} \)} construct, the matcher remembers
the beginning and end of the text matched by that construct. Then,
Replace every match for @var{regexp} with @var{newstring}.
@end table
+@cindex back reference, in regexp replacement
In @code{replace-regexp}, the @var{newstring} need not be constant:
it can refer to all or part of what is matched by the @var{regexp}.
@samp{\&} in @var{newstring} stands for the entire match being
replaced. @samp{\@var{d}} in @var{newstring}, where @var{d} is a
digit, stands for whatever matched the @var{d}th parenthesized
-grouping in @var{regexp}. @samp{\#} refers to the count of
-replacements already made in this command, as a decimal number. In
-the first replacement, @samp{\#} stands for @samp{0}; in the second,
-for @samp{1}; and so on. For example,
+grouping in @var{regexp}. (This is called a ``back reference''.)
+@samp{\#} refers to the count of replacements already made in this
+command, as a decimal number. In the first replacement, @samp{\#}
+stands for @samp{0}; in the second, for @samp{1}; and so on. For
+example,
@example
M-x replace-regexp @key{RET} c[ad]+r @key{RET} \&-safe @key{RET}
@item M-x multi-occur-in-matching-buffers @key{RET} @var{bufregexp} @key{RET} @var{regexp} @key{RET}
This function is similar to @code{multi-occur}, except the buffers to
search are specified by a regular expression that matches visited
-filenames. With a prefix argument, it uses the regular expression to match
+file names. With a prefix argument, it uses the regular expression to match
buffer names instead.
@item M-x how-many @key{RET} @var{regexp} @key{RET}