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Clarify docs about regexp syntax-dependent character classes

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* doc/lispref/searching.texi (Char Classes, Rx Constructs)
(Regexp Problems): Note that character classes don't take syntax
properties into account.
This commit is contained in:
Mattias Engdegård 2023-07-28 11:14:01 +02:00
parent 0ecf2549a2
commit aa360dfc3e
1 changed files with 9 additions and 1 deletions
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doc/lispref/searching.texi
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@ -669,6 +669,10 @@ This matches the hexadecimal digits: @samp{0} through @samp{9}, @samp{a}
through @samp{f} and @samp{A} through @samp{F}.
@end table
The classes @samp{[:space:]}, @samp{[:word:]} and @samp{[:punct:]} use
the syntax-table of the current buffer but not any overriding syntax
text properties (@pxref{Syntax Properties}).
@node Regexp Backslash
@subsubsection Backslash Constructs in Regular Expressions
@cindex backslash in regular expressions
@ -1341,6 +1345,9 @@ Match any @acronym{ASCII} character (codes 0--127).
Match any non-@acronym{ASCII} character (but not raw bytes).
@end table
The classes @code{space}, @code{word} and @code{punct} use the
syntax-table of the current buffer but not any overriding syntax text
properties (@pxref{Syntax Properties}).@*
Corresponding string regexp: @samp{[[:@var{class}:]]}
@item @code{(syntax @var{syntax})}
@ -1920,7 +1927,8 @@ causing a match to fail early.
@item
Avoid or-patterns in favor of bracket expressions: write
@samp{[ab]} instead of @samp{a\|b}. Recall that @samp{\s-} and @samp{\sw}
are equivalent to @samp{[[:space:]]} and @samp{[[:word:]]}, respectively.
are equivalent to @samp{[[:space:]]} and @samp{[[:word:]]}, respectively,
most of the time.
@item
Since the last branch of an or-pattern does not add a backtrack point