VERIFY function
Purpose: VERIFY returns TRUE if every character in StrToTest$ is in ValidCharacters$. Otherwise, FALSE is returned.
Syntax: RetVal = VERIFY(StrToTest$, ValidCharacters$) Parameters:
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Example:
DIM RetVal RetVal = VERIFY("+135.79" , "eE+-.0123456789" ): PRINT i ' TRUE RetVal = VERIFY("-135.79" , "eE+-.0123456789" ): PRINT i ' TRUE RetVal = VERIFY("_135.79" , "eE+-.0123456789" ): PRINT i ' FALSE