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| author | Mattias Engdegård <mattiase@acm.org> | 2019-02-25 15:22:02 +0100 |
|---|---|---|
| committer | Mattias Engdegård <mattiase@acm.org> | 2019-03-02 16:22:37 +0100 |
| commit | 7bda34af52687440632127b4b79986e951b978b1 (patch) | |
| tree | be661e3d387f6bea5043746309b7d337da9e9014 /etc | |
| parent | da758046da74e33273265cd2e72a8aa1a0c9c7e3 (diff) | |
| download | emacs-7bda34af52687440632127b4b79986e951b978b1.tar.gz | |
Correct regexp-opt return value for empty string list
When regexp-opt is called with an empty list of strings, return a regexp
that doesn't match anything instead of the empty string (Bug#20307).
* doc/lispref/searching.texi (Regular Expression Functions):
* etc/NEWS:
Document the new behaviour.
* lisp/emacs-lisp/regexp-opt.el (regexp-opt):
Return a never-match regexp for empty inputs.
Diffstat (limited to 'etc')
| -rw-r--r-- | etc/NEWS | 6 |
1 files changed, 6 insertions, 0 deletions
@@ -1649,6 +1649,12 @@ in any order. If the new third argument is non-nil, the match is guaranteed to be performed in the order given, as if the strings were made into a regexp by joining them with '\|'. ++++ +** The function 'regexp-opt', when given an empty list of strings, now +returns a regexp that never matches anything, which is an identity for +this operation. Previously, the empty string was returned in this +case. + * Changes in Emacs 27.1 on Non-Free Operating Systems |