From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Vaidheeswaran C Newsgroups: gmane.emacs.bugs Subject: bug#20806: 25.0.50; `string-match' is confused??? 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X-detected-operating-system: by eggs.gnu.org: Error: Malformed IPv6 address (bad octet value). X-Mailman-Approved-At: Sat, 13 Jun 2015 14:42:49 -0400 X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 140.186.70.43 X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Original-Sender: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.bugs:103909 Archived-At: Is an empty string a prefix of all strings or not? `string-match' should settle this matter first. Here is an eshell transaction. ---------------------------------------------------------------- Welcome to the Emacs shell /tmp $ (string-match "\\(.*\\)" "") 0 /tmp $ (string-match "foo" "") /tmp $ ---------------------------------------------------------------- Here is how I ended up with this bug. Debugger entered--Lisp error: (error "Regexp cannot match an empty string") signal(error ("Regexp cannot match an empty string")) error("Regexp cannot match an empty string") hi-lock-regexp-okay("\\(.*\\)") byte-code("\300\301\302\303\"!\304 D\207" [hi-lock-regexp-okay read-regexp "Regexp to highlight" regexp-history-last hi-lock-read-face-name] 4) call-interactively(highlight-regexp nil nil) command-execute(highlight-regexp)