On a wide 2.7 and 3.3 all the 3 tests pass.

On a narrow 3.2 I get 
match 1 passed
Traceback (most recent call last):
  File "/home/wolf/dev/py/3.2/Lib/functools.py", line 176, in wrapper
    result = cache[key]
KeyError: (<class 'str'>, '[𝒜-𝒵]', 32)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "bigrange.py", line 16, in <module>
    if re.search("[𝒜-𝒵]", "𝒞", flags): 
  File "/home/wolf/dev/py/3.2/Lib/re.py", line 158, in search
    return _compile(pattern, flags).search(string)
  File "/home/wolf/dev/py/3.2/Lib/re.py", line 255, in _compile
    return _compile_typed(type(pattern), pattern, flags)
  File "/home/wolf/dev/py/3.2/Lib/functools.py", line 180, in wrapper
    result = user_function(*args, **kwds)
  File "/home/wolf/dev/py/3.2/Lib/re.py", line 267, in _compile_typed
    return sre_compile.compile(pattern, flags)
  File "/home/wolf/dev/py/3.2/Lib/sre_compile.py", line 491, in compile
    p = sre_parse.parse(p, flags)
  File "/home/wolf/dev/py/3.2/Lib/sre_parse.py", line 692, in parse
    p = _parse_sub(source, pattern, 0)
  File "/home/wolf/dev/py/3.2/Lib/sre_parse.py", line 315, in _parse_sub
    itemsappend(_parse(source, state))
  File "/home/wolf/dev/py/3.2/Lib/sre_parse.py", line 461, in _parse
    raise error("bad character range")
sre_constants.error: bad character range