diff options
Diffstat (limited to 'lisp/subr.el')
| -rw-r--r-- | lisp/subr.el | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/lisp/subr.el b/lisp/subr.el index be21dc67a0d..05fb9fea68f 100644 --- a/lisp/subr.el +++ b/lisp/subr.el @@ -5544,4 +5544,8 @@ returned list are in the same order as in TREE. ;; for discoverability: (defalias 'flatten-list 'flatten-tree) +;; The initial anchoring is for better performance in searching matches. +(defconst regexp-unmatchable "\\`a\\`" + "Standard regexp guaranteed not to match any string at all.") + ;;; subr.el ends here |