def unescape(inp, char_pairs):
    """Unescape reserved characters specified in the list of tuples `char_pairs`
    
    Parameters
    ----------
    inp : str
        Input string
    
    
    Returns
    -------
    str
        Unescaped output
    
    
    See also
    --------
    escape_GFF3
    """
    for repl, char_ in reversed(char_pairs):
        inp = inp.replace(char_, repl)

    return inp