On Saturday 13 June 2015 03:03 PM, Vaidheeswaran C wrote:

> 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)
> 


The attached patch solves the above issue.  I hope it is OK.

(Stupid me got the title wrong.  Apologies.)