Support re.Pattern and bare type as types

[Bobronium]

Initial Checks

• I have searched Google & GitHub for similar requests and couldn't find anything
• I have read and followed the docs and still think this feature is missing

Description

Ref: #4334 (comment)

import re
import typing
from pydantic import BaseModel

class Model(BaseModel):
    typing_pattern: typing.Pattern  # this is supported
    re_pattern: re.Pattern  # RuntimeError: no validator found for <class 're.Pattern'>, see `arbitrary_types_allowed` in Config

from typing import Type
from pydantic import BaseModel

class Model(BaseModel):
    cls: Type  # treated as Type[Any]
    cls: type  # RuntimeError: no validator found for <class 'type'>, see `arbitrary_types_allowed` in Config

It's pretty easy to fix, but my hands are full now. Would appreciate somebody picking this up.

Would require adding or self.type_ is re.Pattern here:

pydantic/pydantic/fields.py

Line 599 in 11d8589

elif self.type_ is Pattern:

adding or type_ is re.Pattern here:

pydantic/pydantic/validators.py

Line 687 in 11d8589

if type_ is Pattern:

and replacing part after or with field_type is type_ and (type_ is Pattern or type_ is re.Pattern)

pydantic/pydantic/schema.py

Line 805 in 11d8589

if lenient_issubclass(field_type, type_) or field_type is type_ is Pattern:

As for bare type, you'd need to add if type_ is type: return True before this line:

pydantic/pydantic/typing.py

Line 572 in 11d8589

if get_origin(type_) is None:

Affected Components

• Compatibility between releases
• Data validation/parsing
• Data serialization - .dict() and .json()
• JSON Schema
• Dataclasses
• Model Config
• Field Types - adding or changing a particular data type
• Function validation decorator
• Generic Models
• Other Model behaviour - construct(), pickling, private attributes, ORM mode
• Settings Management
• Plugins and integration with other tools - mypy, FastAPI, python-devtools, Hypothesis, VS Code, PyCharm, etc.

[hramezani]

I've created a PR to add re.Pattern #4366
I will create another one for type soon