[texhax] The last character of a string

[Uwe Lück]

At 20:26 29.01.10, Donald Arseneau wrote:
>Michael Barr <barr at math.mcgill.ca> writes:
>
> > Is there a simple way to find the last character of a string?
>
>You have to scan through the tokens from first to last.

Sometimes I think you don't read my postings (I may know why, sometimes you 
gave the same advice that I gave earlier). I demonstrated how to test 
whether a certain token is the the last one without scanning the list.

> > What I want to do is add a period unless the string already
> > ends in a period, question mark, or exclamation mark,
>
>Oh that's easy -- check the value of \spacefactor.
>Easy, but not 100% reliable.

That's right! Even if you prefer \frenchspacing, you can assign a 
\spacefactor of 1001 to the dot etc.

Cheers,

     Uwe.