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Use [^z-a] for matching any character (anychar/anything) in rx

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* lisp/emacs-lisp/rx.el (rx--translate-symbol):
* test/lisp/emacs-lisp/rx-tests.el (rx-any, rx-atoms):
Use [^z-a] instead of ".\\|\n" for anychar.

The new expression is faster (about 2×) and does not allocate regexp
stack space.  For example, (0+ anychar) now matches strings of any
size (bug#37659).
This commit is contained in:
Mattias Engdegård 2019-10-09 10:22:10 +02:00
parent ae5407b857
commit 6331d23de3
2 changed files with 4 additions and 4 deletions
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2
lisp/emacs-lisp/rx.el
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@ -136,7 +136,7 @@ Each entry is:
;; Use `list' instead of a quoted list to wrap the strings here,
;; since the return value may be mutated.
((or 'nonl 'not-newline 'any) (cons (list ".") t))
((or 'anychar 'anything) (rx--translate-form '(or nonl "\n")))
((or 'anychar 'anything) (cons (list "[^z-a]") t))
('unmatchable (rx--empty))
((or 'bol 'line-start) (cons (list "^") 'lseq))
((or 'eol 'line-end) (cons (list "$") 'rseq))