clearVars( [options] )
    Deletes user-defined variables in the current workspace.

    Parameters
    ----------
    options: Object (optional)
    	Options.

    options.include: RegExp|ArrayLikeObject (optional)
    	Variable name inclusion filter.

    options.exclude: RegExp|ArrayLikeObject (optional)
    	Variable name exclusion filter.

    Examples
    --------
    > var x = 3.14;
    > x
    > clearVars();
    > x

    See Also
    --------
    clearWorkspace, vars