StringToToken:

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   Finds the first token in a string

   Since version 3.
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   Form:
   [t, r] = StringToToken( s )
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   ------
   Inputs
   ------
   s       (:)   String (may be a cell element)

   -------
   Outputs
   -------
   t       (1,:) Character string with the token
   r       (1,:) Remainder of the string

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