def _all_delimiters_str():
    """delimiter = %x09 / %x20-2F / %x3B-40 / %x5B-60 / %x7B-7E"""
    delimiters = '\t'
    for i in range(32, 48):
        delimiters = delimiters + chr(i)
    for i in range(59, 65):
        delimiters = delimiters + chr(i)
    for i in range(91, 97):
        delimiters = delimiters + chr(i)
    for i in range(123, 127):
        delimiters = delimiters + chr(i)
    return delimiters
