[NTG-context] function that purges 8 bit text?

[Hans Hagen]

Henning Hraban Ramm wrote:

> Is there a possibility to strip all invalid chars from a string, so that
> \SkillField{Erzählen}{0} can define a field named "Erzaehlen" or 
> "Erzhlen" or "Erzahlen"?
> (Sorry, I can't program in TeX.)

just make me s small test file

there is lots of sanitizing code/trickery out there, but need a simple self 
contained example

Hans

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