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| author | Mattias Engdegård <mattiase@acm.org> | 2019-05-14 11:43:49 +0200 |
|---|---|---|
| committer | Mattias Engdegård <mattiase@acm.org> | 2019-05-15 18:55:27 +0200 |
| commit | 26f735ff198e52370aafe09ed5ed669e78f196ab (patch) | |
| tree | b54c83556db3e13b5852642c84097ee0c4531778 /lisp/progmodes/octave.el | |
| parent | d0ebc389ebba0ca5b99e019c47c4a616941378ac (diff) | |
| download | emacs-26f735ff198e52370aafe09ed5ed669e78f196ab.tar.gz | |
Add standard unmatchable regexp
Add `regexp-unmatchable' as a standard unmatchable regexp, defined as
"\\`a\\`". Use it where such a regexp is needed, replacing slower
expressions in several places.
From a suggestion by Philippe Schnoebelen.
* lisp/subr.el (regexp-unmatchable): New defconst.
* etc/NEWS (Lisp Changes): Mention `regexp-unmatchable'.
* doc/lispref/searching.texi (Regexp Functions): Document it.
* lisp/emacs-lisp/regexp-opt.el (regexp-opt)
* lisp/progmodes/cc-defs.el (cc-conditional-require-after-load)
(c-make-keywords-re)
* lisp/progmodes/cc-engine.el (c-beginning-of-statement-1)
(c-forward-<>-arglist-recur, c-forward-decl-or-cast-1)
(c-looking-at-decl-block)
* lisp/progmodes/cc-fonts.el (c-doc-line-join-re)
(c-doc-bright-comment-start-re)
* lisp/progmodes/cc-langs.el (c-populate-syntax-table)
(c-assignment-op-regexp)
(c-block-comment-ender-regexp, c-font-lock-comment-end-skip)
(c-block-comment-start-regexp, c-line-comment-start-regexp)
(c-doc-comment-start-regexp, c-decl-start-colon-kwd-re)
(c-type-decl-prefix-key, c-type-decl-operator-prefix-key)
(c-pre-id-bracelist-key, c-enum-clause-introduction-re)
(c-nonlabel-token-2-key)
* lisp/progmodes/cc-mode.el (c-doc-fl-decl-start, c-doc-fl-decl-end)
* lisp/progmodes/cc-vars.el (c-noise-macro-with-parens-name-re)
(c-noise-macro-name-re, c-make-noise-macro-regexps)
* lisp/progmodes/octave.el (octave-help-mode)
* lisp/vc/vc-bzr.el (vc-bzr-log-view-mode, vc-bzr-revision-completion-table)
* lisp/vc/vc-git.el (vc-git-log-view-mode)
* lisp/vc/vc-hg.el (vc-hg-log-view-mode)
* lisp/vc/vc-mtn.el (vc-mtn-log-view-mode):
Use `regexp-unmatchable'.
* lisp/textmodes/ispell.el (ispell-non-empty-string):
Use `regexp-unmatchable', fixing a broken never-match regexp.
Diffstat (limited to 'lisp/progmodes/octave.el')
| -rw-r--r-- | lisp/progmodes/octave.el | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/lisp/progmodes/octave.el b/lisp/progmodes/octave.el index 52e5fd477f4..8a7e24e5ada 100644 --- a/lisp/progmodes/octave.el +++ b/lisp/progmodes/octave.el @@ -1691,7 +1691,7 @@ code line." (eval-and-compile (require 'help-mode)) ;; Don't highlight `EXAMPLE' as elisp symbols by using a regexp that ;; can never match. - (setq-local help-xref-symbol-regexp "x\\`")) + (setq-local help-xref-symbol-regexp regexp-unmatchable)) (defun octave-help (fn) "Display the documentation of FN." |