Replace exponential in name for FieldnameResolver

[PTank]

[#749]
Numbers ¹ to ⁹ were not supported by '\W' in re.sub

schema example

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "array",
  "items": {
    "type": "object",
    "properties": {
      "test": {
  	"type": "string",
  	"default": "²",
  	"enum": [
  	  "²",
  	  "oky⁵"
  	]
     }
    }
  }
}

Do an infinite loop before the fix in

while not (
            new_name.isidentifier() ...

Output with the fix

# cmd: datamodel-codegen --input-file-type jsonschema --input
 schema.json 
# generated by datamodel-codegen:
#   filename:  schema.json
#   timestamp: 2022-08-27T10:04:55+00:00

from __future__ import annotations

from enum import Enum
from typing import List, Optional

from pydantic import BaseModel


class Test(Enum):
    _ = '²'
    oky_ = 'oky⁵'


class ModelItem(BaseModel):
    test: Optional[Test] = '²'


class Model(BaseModel):
    __root__: List[ModelItem]

[codecov]

Codecov Report

Merging #833 (651dd35) into master (e9b6edf) will not change coverage.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##            master      #833     +/-   ##
===========================================
  Coverage   100.00%   100.00%             
===========================================
  Files           11        21     +10     
  Lines         1020      2518   +1498     
  Branches       201       558    +357     
===========================================
+ Hits          1020      2518   +1498     

Flag	Coverage Δ
unittests	99.92% <99.89%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
datamodel_code_generator/model/__init__.py	100.00% <ø> (ø)
datamodel_code_generator/__init__.py	100.00% <100.00%> (ø)
datamodel_code_generator/__main__.py	100.00% <100.00%> (ø)
datamodel_code_generator/format.py	100.00% <100.00%> (ø)
datamodel_code_generator/http.py	100.00% <100.00%> (ø)
datamodel_code_generator/imports.py	100.00% <100.00%> (ø)
datamodel_code_generator/model/base.py	100.00% <100.00%> (ø)
datamodel_code_generator/model/enum.py	100.00% <100.00%> (ø)
...atamodel_code_generator/model/pydantic/__init__.py	100.00% <100.00%> (ø)
...amodel_code_generator/model/pydantic/base_model.py	100.00% <100.00%> (ø)
... and 18 more

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[koxudaxi]

@PTank
Thank you for creating the PR.
I'm sorry for the late release of the fixed 🙇
version 0.13.2 has been released.
https://github.com/koxudaxi/datamodel-code-generator/releases/tag/0.13.2