Thank you for your responses!

I think Maxim is right and embedded Perl is the way to go.

Bernd's idea would work if there was an easy way to generate a map file with hyphens from the source file.
However the source file has 200k+ entries that look like this:
[code]
thisisthebestnewsever 123456;
expertsadvicetoeatmorefish 123457;
...
[/code]
I can not think of an automated way to convert this to:
[code]
this-is-the-best-news-ever 123456;
thisisthebestnewsever 123456;
experts-advice-to-eat-more-fish 123457;
expertsadvicetoeatmorefish 123457;
...
[/code]
Knowing that the map module is case-insensitive may safe me from confusion in the future.

Thanks again,
Bart