我正在嘗試為用戶名輸入添加一個帶有正則運算式的自定義驗證器。
用戶名應僅包含 az、AZ、0-9 和 _，并且長度在 3 到 20 個字符之間。
class Validator(validators.RegexValidator):
regex = r"^[A-Za-z0-9_]{3,20} \Z"
flags = re.ASCII
當沒有字符范圍時，RegEx 作業正常，即 r"^[A-Za-z0-9_] \Z"
而且我認為{3,20}是指定長度的正確方法......所以我不確定為什么正則運算式不起作用。
re.error: multiple repeat at position 19無論我嘗試驗證的字串如何，我都會收到此錯誤。
完整追溯：
backend-web-1 | Traceback (most recent call last):
backend-web-1 | File "/usr/local/lib/python3.10/site-packages/django/core/handlers/exception.py", line 47, in inner
backend-web-1 | response = get_response(request)
backend-web-1 | File "/usr/local/lib/python3.10/site-packages/django/core/handlers/base.py", line 181, in _get_response
backend-web-1 | response = wrapped_callback(request, *callback_args, **callback_kwargs)
backend-web-1 | File "/usr/local/lib/python3.10/site-packages/django/views/decorators/csrf.py", line 54, in wrapped_view
backend-web-1 | return view_func(*args, **kwargs)
backend-web-1 | File "/usr/local/lib/python3.10/site-packages/django/views/generic/base.py", line 70, in view
backend-web-1 | return self.dispatch(request, *args, **kwargs)
backend-web-1 | File "/usr/local/lib/python3.10/site-packages/django/utils/decorators.py", line 43, in _wrapper
backend-web-1 | return bound_method(*args, **kwargs)
backend-web-1 | File "/usr/local/lib/python3.10/site-packages/django/views/decorators/debug.py", line 89, in sensitive_post_parameters_wrapper
backend-web-1 | return view(request, *args, **kwargs)
backend-web-1 | File "/usr/local/lib/python3.10/site-packages/dj_rest_auth/registration/views.py", line 47, in dispatch
backend-web-1 | return super().dispatch(*args, **kwargs)
backend-web-1 | File "/usr/local/lib/python3.10/site-packages/rest_framework/views.py", line 509, in dispatch
backend-web-1 | response = self.handle_exception(exc)
backend-web-1 | File "/usr/local/lib/python3.10/site-packages/rest_framework/views.py", line 469, in handle_exception
backend-web-1 | self.raise_uncaught_exception(exc)
backend-web-1 | File "/usr/local/lib/python3.10/site-packages/rest_framework/views.py", line 480, in raise_uncaught_exception
backend-web-1 | raise exc
backend-web-1 | File "/usr/local/lib/python3.10/site-packages/rest_framework/views.py", line 506, in dispatch
backend-web-1 | response = handler(request, *args, **kwargs)
backend-web-1 | File "/usr/local/lib/python3.10/site-packages/rest_framework/generics.py", line 190, in post
backend-web-1 | return self.create(request, *args, **kwargs)
backend-web-1 | File "/usr/local/lib/python3.10/site-packages/dj_rest_auth/registration/views.py", line 66, in create
backend-web-1 | serializer.is_valid(raise_exception=True)
backend-web-1 | File "/usr/local/lib/python3.10/site-packages/rest_framework/serializers.py", line 220, in is_valid
backend-web-1 | self._validated_data = self.run_validation(self.initial_data)
backend-web-1 | File "/usr/local/lib/python3.10/site-packages/rest_framework/serializers.py", line 419, in run_validation
backend-web-1 | value = self.to_internal_value(data)
backend-web-1 | File "/usr/local/lib/python3.10/site-packages/rest_framework/serializers.py", line 478, in to_internal_value
backend-web-1 | validated_value = validate_method(validated_value)
backend-web-1 | File "/usr/local/lib/python3.10/site-packages/dj_rest_auth/registration/serializers.py", line 205, in validate_username
backend-web-1 | username = get_adapter().clean_username(username)
backend-web-1 | File "/usr/local/lib/python3.10/site-packages/allauth/account/adapter.py", line 255, in clean_username
backend-web-1 | validator(username)
backend-web-1 | File "/usr/local/lib/python3.10/site-packages/django/core/validators.py", line 48, in __call__
backend-web-1 | regex_matches = self.regex.search(str(value))
backend-web-1 | File "/usr/local/lib/python3.10/site-packages/django/utils/functional.py", line 246, in inner
backend-web-1 | self._setup()
backend-web-1 | File "/usr/local/lib/python3.10/site-packages/django/utils/functional.py", line 382, in _setup
backend-web-1 | self._wrapped = self._setupfunc()
backend-web-1 | File "/usr/local/lib/python3.10/site-packages/django/utils/regex_helper.py", line 345, in _compile
backend-web-1 | return re.compile(regex, flags)
backend-web-1 | File "/usr/local/lib/python3.10/re.py", line 251, in compile
backend-web-1 | return _compile(pattern, flags)
backend-web-1 | File "/usr/local/lib/python3.10/re.py", line 303, in _compile
backend-web-1 | p = sre_compile.compile(pattern, flags)
backend-web-1 | File "/usr/local/lib/python3.10/sre_compile.py", line 764, in compile
backend-web-1 | p = sre_parse.parse(p, flags)
backend-web-1 | File "/usr/local/lib/python3.10/sre_parse.py", line 948, in parse
backend-web-1 | p = _parse_sub(source, state, flags & SRE_FLAG_VERBOSE, 0)
backend-web-1 | File "/usr/local/lib/python3.10/sre_parse.py", line 443, in _parse_sub
backend-web-1 | itemsappend(_parse(source, state, verbose, nested 1,
backend-web-1 | File "/usr/local/lib/python3.10/sre_parse.py", line 671, in _parse
backend-web-1 | raise source.error("multiple repeat",
backend-web-1 | re.error: multiple repeat at position 19
uj5u.com熱心網友回復：
這與 Django 沒有任何關系。模式本身是非法的（至少在 Python 中是這樣）。
{3,20}已經說“3到20次”。在 它之后立即擁有（這意味著“一次或多次”）是沒有意義的。
您正在尋找的模式是r"^[A-Za-z0-9_]{3,20}\Z"。
編輯：顯然在某些正則運算式引擎（不是 Python 的）中{3,20} 是合法的，但 意味著其他東西（即不是“最后一場比賽的一次或多次”）。參見http://www.rexegg.com/regex-quantifiers.html#possessive（感謝@The第四只鳥提供鏈接）
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