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Improve documentation of regexp ranges

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* doc/lispref/searching.texi (Regexp Special): Document the effect
of using octal escapes in regexp ranges.  (Bug#17758)
This commit is contained in:
Eli Zaretskii 2021-05-30 13:20:02 +03:00
parent 30e5d93ee1
commit 5dfa5e26dd
1 changed files with 8 additions and 1 deletions
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doc/lispref/searching.texi
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@ -363,7 +363,7 @@ preceding expression either once or not at all. For example,
@anchor{Non-greedy repetition}
@item @samp{*?}, @samp{+?}, @samp{??}
@cindex non-greedy repetition characters in regexp
These are @dfn{non-greedy} variants of the operators @samp{*}, @samp{+}
are @dfn{non-greedy} variants of the operators @samp{*}, @samp{+}
and @samp{?}. Where those operators match the largest possible
substring (consistent with matching the entire containing expression),
the non-greedy variants match the smallest possible substring
@ -438,6 +438,13 @@ including newline. However, a reversed range should always be from
the letter @samp{z} to the letter @samp{a} to make it clear that it is
not a typo; for example, @samp{[+-*/]} should be avoided, because it
matches only @samp{/} rather than the likely-intended four characters.
@item
If the end points of a range are raw 8-bit bytes (@pxref{Text
Representations}), or if the range start is ASCII and the end is a raw
byte (as in @samp{[a-\377]}), the range will match only ASCII
characters and raw 8-bit bytes, but not non-ASCII characters. This
feature is intended for searching text in unibyte buffers and strings.
@end enumerate
Some kinds of character alternatives are not the best style even