Hi All;

I would like to match a string  if it has only cero or more of a defined
set of characters. 
For example:
if "GACT"  are the characters, then

GACTNGACT ## This string should not be matched because it has the extra
character N
GACCCCCCC ## This could be matched;

Any help to solve this problem will be greatly appreciated.

cheers
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PEDRO A. RECHE , pHD                TL: 617 632 3824
Bioinformatics Research Scientist   FX: 617 632 4569
Dana-Farber Cancer Institute,       EM: [EMAIL PROTECTED]
Molecular Immunology Foundation,    EM: [EMAIL PROTECTED]
Harvard Medical School,             W3: http://www.mifoundation.org 
44 Binney Street, D1510A,
Boston, MA 02115                                                
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