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26f735ff19
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. |
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