diff options
| -rw-r--r-- | lisp/emacs-lisp/regexp-opt.el | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/lisp/emacs-lisp/regexp-opt.el b/lisp/emacs-lisp/regexp-opt.el index de36f1d544..e849cd60b9 100644 --- a/lisp/emacs-lisp/regexp-opt.el +++ b/lisp/emacs-lisp/regexp-opt.el @@ -205,7 +205,10 @@ so we can use character sets rather than grouping parenthesis." (if (> (length xiffus) 0) ;; common suffix: take it and recurse on the prefixes. (let* ((n (- (length xiffus))) - (prefixes (mapcar (lambda (s) (substring s 0 n)) strings))) + (prefixes + ;; Sorting is necessary in cases such as ("ad" "d"). + (sort (mapcar (lambda (s) (substring s 0 n)) strings) + 'string-lessp))) (concat open-group (regexp-opt-group prefixes t t) (regexp-quote |