Dr J R Stockton wrote:
> One could easily be written, e.g. by yourself. A TEXTAREA for input,
> a BUTTON, a TEXTAREA for output, and a series of RegExps, acting on
> the content of the first area and writing to the second.

If you are going to go that route, write it in Perl and take advantage
of the HTML::Entities module. No need to write all those regexen.