string manipulation question

[Kenneth Brody]

Tony Ryder wrote:
[...]
> > As long as you don't want to computer two quotes into four, use the
> > following edit:
> > 
> >     { {!" "!}@ | "'"<"'"> | * }
> > 
> > This will convert one single-quote into two, and it will leave two
> > single-quotes as two.
> 
> I do not understand what the @ sign does in this edit.

It matches EOF, so that only trailing spaces are deleted.  Otherwise, all
spaces within the field would be removed.

Question to ponder:

    Why does the edit fail if the data has any single quotes, and you don't
    strip trailing spaces?

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