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Mattias Engdegård authored
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.
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