create isExpression property to encapsulate syntax test
create isExpression property to encapsulate syntax test

ISNIT0/ractive,ISNIT0/ractive,JonDum/ractive,marcalexiei/ractive,JonDum/ractive,ractivejs/ractive,JonDum/ractive,ractivejs/ractive,marcalexiei/ractive,marcalexiei/ractive,ISNIT0/ractive,ractivejs/ractive