Re: FYI: Regex paper for UTC

From: Hans Aberg (
Date: Sat Oct 13 2007 - 09:07:16 CDT

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    On 10 Oct 2007, at 19:38, Mark Davis wrote:

    > Andy and I put together a paper of recommendations for the UTC at
    > .

    I suspect you will run into problems when mixing complement with the
    Kleene closure (zero or more concatenations) operator (and other
    operators generating an infinite number of strings in the associated

    So one safe way is to admit the usual set operations on character
    classes only, and letting regular expressions having only the usual
    operators acting on character classes.

    If you don't use such infinite generating operators, the restriction
    forms a graded algebra, and it seems me you want the complement with
    respect to the grading (length of strings) in the generated language.

       Hans Åberg

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