Backward search in the internal viewer

[Andrew V. Samoilov]

Pavel Roskin wrote:
> On Wed, 23 Oct 2002, Andrew V. Samoilov wrote:
> 
> I didn't realize at that time that regex search backwards is hard.  
> Please resend your patch or just apply it if you are certain that it's OK.

I resend this patch, please test it for some days before applying,
I sow some strange effects in the hex editor (tab was not working and 
highlighting was wrong) but cannot reproduce it and I cannot say it is 
side effect of this patch.  Also is it right to change direction by 
clicking "Backward" check button and entering empty string as search string?

-- 
Regards,
Andrew V. Samoilov
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