RE: using non-Emacs regexp syntax

[Drew Adams]

> > Juri proposed a simple implementation: 'setting a new variable
> > `search-dot-regexp' to "\\(.\\|[\\n]\\)".'
>
> There's already a much more efficient implementation.  See regex.h:
>
>    /* If this bit is set, then . matches newline.
>       If not set, then it doesn't.  */
>    #define RE_DOT_NEWLINE (RE_CONTEXT_INVALID_OPS << 1)

Fine, as far as implementation goes. What's still needed then is Lisp access
(Lisp variable) and making a toggle command for the variable.