I am using below code trying to get all the records that, the "user\_name" field OR the "text" field contains the specified keyword, it looks like pymongo treat the operation to be AND, how to specify the pymongo to treat it the "OR" operation?

```
search_dict = {}

text_regex = ".*" + key + ".*";
text_reg = re.compile(text_regex,re.IGNORECASE)
search_dict["text"] = text_reg

user_name_regex = ".*" + key + ".*";
user_name_reg = re.compile(user_name_regex,re.IGNORECASE)
search_dict["user_name"] = user_name_reg

records = gLife_Article_Collection.find(search_dict)

```