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* searching.texi (Regexp Backslash): Also refer to shy groups as

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non-capturing or unnumbered groups.
(Regexp Functions): Add cross-reference to Regexp Backslash.
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Chong Yidong 2009-04-15 21:54:15 +00:00
parent b0f439fc19
commit 80d7cdca53
2 changed files with 15 additions and 6 deletions
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4
doc/lispref/ChangeLog
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@ -1,5 +1,9 @@
2009-04-15 Chong Yidong <cyd@stupidchicken.com>
* searching.texi (Regexp Backslash): Also refer to shy groups as
non-capturing or unnumbered groups.
(Regexp Functions): Add cross-reference to Regexp Backslash.
* display.texi (Truncation): Overlays can use line-prefix and
wrap-prefix too.
(Overlay Properties): Document wrap-prefix and line-prefix.

17
doc/lispref/searching.texi
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@ -654,14 +654,19 @@ occasionally there is a conflict, and that led to the introduction of
shy groups.
@item \(?: @dots{} \)
@cindex shy groups
@cindex non-capturing group
@cindex unnumbered group
is the @dfn{shy group} construct. A shy group serves the first two
purposes of an ordinary group (controlling the nesting of other
operators), but it does not get a number, so you cannot refer back to
its value with @samp{\@var{digit}}.
its value with @samp{\@var{digit}}. Shy groups are particularly
useful for mechanically-constructed regular expressions, because they
can be added automatically without altering the numbering of ordinary,
non-shy groups.
Shy groups are particularly useful for mechanically-constructed regular
expressions because they can be added automatically without altering the
numbering of any ordinary, non-shy groups.
Shy groups are also called @dfn{non-capturing} or @dfn{unnumbered
groups}.
@item \(?@var{num}: @dots{} \)
is the @dfn{explicitly numbered group} construct. Normal groups get
@ -939,8 +944,8 @@ regular expression which is equivalent to the actual value
@defun regexp-opt-depth regexp
This function returns the total number of grouping constructs
(parenthesized expressions) in @var{regexp}. (This does not include
shy groups.)
(parenthesized expressions) in @var{regexp}. This does not include
shy groups (@pxref{Regexp Backslash}).
@end defun
@node Regexp Search