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Is it possible to have an undetermined character length argument in a macro?

I have the following macro, \def\RCS$ $#1: #2 $ ${\expandafter\def\csname RCS#1\endcsname{#2}} Which is used for revision version control, i.e, \RCS$ $Revision: 1.2 $ $ \RCS$ $Date: 2010/04/02 ...