[Fun With Perl] What does this do?

["Juanma Barranquero" <barranquero@laley-actualidad.es>]

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On Thu, 17 Jun 1999 12:15:13 -0400, "Bill Jones" <bill@fccj.org>
wrote:

>It should be a syntax error in that the last \E belongs to
>the LAST \U

That still doesn't explain why it fails just by adding a \l that
shouldn't affect \U or \L (but it does, by way of the reordering that
MJD has brought to our attention).

>The FIRST \L lost it's macro closure \E in the reordering...

The perlop manpage says:

 \L  Lowercase till \E
 \U  Uppercase till \E
 \E  End case modification

Nowhere I read that they should be properly nested and that is not
correct to "open" several levels of \L and \U and close them all with
a single \E. In fact,=20

> print "\Ude LOS sus OJOS tan FUERTEMENTE llorando, \LGIRABA la CABEZA \Uy=
 ESTABALOS mirando\E";
> DE LOS SUS OJOS TAN FUERTEMENTE LLORANDO, giraba la cabeza Y ESTABALOS MI=
RANDO

it works till you put a \l or \u next to an inner \U or \L (and, I
suppose, the automatic reordering kicks in).

                                                       /L/e/k/t/u

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