__contains does not support parenthesis

[LakshmiPrabhaN]

One line description of the issue
__contains in filter does not support parenthesis and gives empty queryset as a result

Example, i need to get this object
{
"channel": '["Admin (role)"]'
}

Python script

models.py

`from djongo import models
import jsonfield

class word(models.Model):
channel = jsonfield.JSONField()`

views.py

queryset = word.objects.filter(channel__contains="Admin (role)")

It translates the query as the following
filter: { channel: { '$regex': '^.*"Admin (role)".*$' } }

But we need the translated query
filter: { channel: { '$regex': '^.*"Admin \\(role\\)".*$' } }

Also tried word.objects.filter(channel__contains="Admin \\(role\\)") but it is not working

Env

Django==2.2.24
django-jsonfield==1.4.1
djangorestframework==3.11.0
djongo==1.3.6
dnspython==2.3.0
pymongo==3.12.1
pytz==2022.7.1
six==1.16.0
sqlparse==0.2.4

[pimuzzo]

the same thing happens to me with the "+" character

[IntelligentSynthesis]

Code
self.to_match = re.sub(r'([]()[{}.*+^$?|\/])', r'\\\g<1>', self.to_match)

Only add one line to operators.py.

Code
self.to_match = re.escape(self.to_match)
I also found a solution in #620. This is a more simple way！
If you are using the older version (not master) of 1.3.6, you can modify operators.py as #620.

[Assassin9520]

OffTopic:

t translates the query as the following
filter: { channel: { '$regex': '^."Admin (role)".$' } }

How can i see the translated query from ORM to mongoDB? looking for too much time now :(