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PYTHON-3028 $regex as a field name does not allow for non-string values #807

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Dec 6, 2021
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2 changes: 1 addition & 1 deletion bson/json_util.py
Original file line number Diff line number Diff line change
Expand Up @@ -508,7 +508,7 @@ def object_hook(dct, json_options=DEFAULT_JSON_OPTIONS):
def _parse_legacy_regex(doc):
pattern = doc["$regex"]
# Check if this is the $regex query operator.
if isinstance(pattern, Regex):
if not isinstance(pattern, (str, bytes)):
return doc
flags = 0
# PyMongo always adds $options but some other tools may not.
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