When a variable has the same two prefixes, the additional environment variable can't `allow` or `forbid`.

[gbaian10]

from pydantic_settings import BaseSettings, SettingsConfigDict


class Settings(BaseSettings):
    model_config = SettingsConfigDict(env_file=".env", extra="allow")

    POSTGRES_USER: str


print(Settings())

.env

POSTGRES_USER=postgres
POSTGRES_USER_2=postgres2  # can't allow or forbid
POSTGRES_NAME=name  # can allow or forbid

output miss POSTGRES_USER_2

POSTGRES_USER='postgres' postgres_name='name'

Replace allow with forbid.

pydantic_core._pydantic_core.ValidationError: 1 validation error for Settings
postgres_name
  Extra inputs are not permitted [type=extra_forbidden, input_value='name', input_type=str]
    For further information visit https://errors.pydantic.dev/2.9/v/extra_forbidden

Missing extra input for POSTGRES_USER_2 raise.

---

pydantic==2.9.1
pydantic-settings==2.4.0

[hramezani]

Thanks @gbaian10 for reporting this issue.
I created #386 to fix the problem.

Could you please confirm?

[gbaian10]

Thanks @gbaian10 for reporting this issue. I created #386 to fix the problem.

Could you please confirm?

@hramezani

The current test output is as expected! Thank you.