I am working through the OReilly book and have got as far as working on 
the little basic interpreter. I Am adding support for float type 
variables, and am trying to modify the lexer. 

I would like to be able to match ('0'..'9')*'.'('0'..'9')* i.e. one or 
more digits, a period, followed bt one or more digits.

I can't see how to do this in OCaml patter matching? Any ideas?

Thanks
George

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