> er...
> s/\t(?!454354)/<br>/g;
> > 
> >     s/\t454354/<br>/g;
> > 
> > .... replace every \t (tab character) which is NOT
> > immediately proceeded
> > by '454354' with '<br>'?
> > 
> > Thanks. I suspect this is any easy one, but I've been staring
> > at it for
> > an hour, and I can't figure it out. Brain not working well today.

Preceeded by the number would be

s/(?<!454354)\t/<br>/g;

 -dave



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