def _all_non_delimiters_str():
    """non-delimiter   = %x00-08 / %x0A-1F / DIGIT / ":" / ALPHA / %x7F-FF"""
    ndels = ':'
    for i in range(0, 9):
        ndels = ndels + chr(i)
    for i in range(10, 32):
        ndels = ndels + chr(i)
    for i in range(0, 10):
        ndels = ndels + str(i)
    for i in range(97, 123):
        ndels = ndels + chr(i)
    for i in range(65, 91):
        ndels = ndels + chr(i)
    for i in range(127, 256):
        ndels = ndels + chr(i)
    return ndels
