Pydantic 驗證。檢查字串是否不包含某些字符

問題內容

我需要確保該字串不包含西里爾字元。我這樣檢查：

from pydantic import basemodel, field

class mymodel(basemodel):
    content_en: str = field(pattern=r"[^а-яА-Я]")


data = mymodel(content_en="has wrong content 'йцукен'")
print(data)
>>> content_en="has wrong content 'йцукен'"

但是當我將包含西里爾字母的字串傳遞到 content_en 欄位時，不會引發錯誤。

預計：

pydantic_core._pydantic_core.validationerror: 1 validation error for mymodel
...

如何檢查正確？

python 3.8

派丹蒂克2.5

解決方案（感謝@chepner）：

class MyModel(BaseModel):
    content_en: str = Field(pattern=r"^[^а-яА-ЯёЁ]*$")

正確答案

您的模式與包含至少一個非西里爾字元的任何字串匹配，而不是僅由非西里爾字元組成的字串。

>>> mymodel(content_en="has wrong content 'йцукен'")
mymodel(content_en="has wrong content 'йцукен'")
>>> mymodel(content_en="йцукен")
traceback (most recent call last):
  file "<stdin>", line 1, in <module>
  file "/users/chepner/py311/lib/python3.11/site-packages/pydantic/main.py", line 164, in __init__
    __pydantic_self__.__pydantic_validator__.validate_python(data, self_instance=__pydantic_self__)
pydantic_core._pydantic_core.validationerror: 1 validation error for mymodel
content_en
  string should match pattern '[^а-яА-Я]' [type=string_pattern_mismatch, input_value='йцукен', input_type=str]
    for further information visit https://errors.pydantic.dev/2.5/v/string_pattern_mismatch

正確的模式是 ^[^а-яА-Я]*$:

#

>>> class MyModel(BaseModel):
...     content_en: str = Field(pattern=r"^[^а-яА-Я]*$")
...
>>> MyModel(content_en="Has wrong content 'йцукен'")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/chepner/py311/lib/python3.11/site-packages/pydantic/main.py", line 164, in __init__
    __pydantic_self__.__pydantic_validator__.validate_python(data, self_instance=__pydantic_self__)
pydantic_core._pydantic_core.ValidationError: 1 validation error for MyModel
content_en
  String should match pattern '^[^а-яА-Я]*$' [type=string_pattern_mismatch, input_value="Has wrong content 'йцукен'", input_type=str]
    For further information visit https://errors.pydantic.dev/2.5/v/string_pattern_mismatch

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