Sorry for the confusion,

I did try the empty regexp as suggested and it "worked" ie no problem appeared.

My problem is to find a regexp for timestamps outside DEADLINE: and SCHEDULE: rows

In other words, given three variables A B C with regexps.

If I have a regexp given by variable A and I want to find a text which satisfies A but DO NOT satisfy B nor C how can I write uch regexp?

2009/1/13 Olaf Dietsche <olaf+list.orgmode@olafdietsche.de>
"Daniel Martins" <danielemc@gmail.com> writes:

> I did your test wuth a null regexp
>
> It is a regexp problem!
>
> Org-mode has two variables: org-deadline-string and org-scheduled-string
> (see below)
>
> and I want to match tasks which have a timestamp, ie satisfies the
> org-ts-regexp2
>
> BUT DO NOT  have org-deadline-string NOR org-scheduled-string
>
> I tried
>
>     (org2rem-pure-timestamps-string
>           (concat  "\\(" org-deadline-string "\\|"
>                org-scheduled-string  "\\)\\{0\\}"))
>
> in order that a regexp such as
>
> "\\(org-deadline-string\\|org-scheduled-string\\)\\{0\\}"
>
> would match only zero {0} occurrences of
> (org-deadline-string|org-scheduled-string)
> but this seems to be a mistake.
>
> Any hint??

I can only suggest the empty regexp, as before:

    (org2rem-pure-timestamps-string "")

If this doesn't work, I don't know.

Regards, Olaf