Mongo Query for Multiple conditions with limit and skip - mongodb

Question

The document format of all collections in db is as :
{
"_id": {
"$oid": "5e0983863bcf0dab51f2872b"
},
"word": "never", // get the `word` value for each of below queries
"wordset_id": "a42b50e85e",
"meanings": [{
"id": "1f1bca9d9f",
"def": "not ever",
"speech_part": "adverb",
"synonyms": ["ne'er"]
}, {
"id": "d35f973ed0",
"def": "not at all",
"speech_part": "adverb"
}]
}
I am trying to query for word/words,
1) where word length is 4 and speech_part is noun containing ac (%something% in sql) in it (The result would jack,......)
2) how to add all three starting with , ending with , containing in single query (eg: starting with j , containing ac , ending with k----> would give jack)
I have tried for 1) as:
pipeline = [
{
"$match": {
"meanings.speech_part": "noun",
"word": "/ac/",
"$expr": {"$eq": [{"$strLenCP": "$word"}, 4]}
}
}
]
query=db[collection].aggregate(pipeline)
But I got no result for this, also how to add skip and limit for an aggregate , should i use facet ?
referring SO answer, i found this:
db.Order.aggregate([
{ '$match' : { "company_id" : ObjectId("54c0...") } },
{ '$sort' : { 'order_number' : -1 } },
{ '$facet' : {
metadata: [ { $count: "total" }, { $addFields: { page: NumberInt(3) } } ],
data: [ { $skip: 20 }, { $limit: 10 } ] // As shown here------
} }
] )

Answer 1

For reference Pythonic pipeline would look like this:
pipeline = [
{
'$match': {
"$expr": {"$eq": [{"$strLenCP": "$word"}, 4]},
'word': re.compile('ac'),
'meanings.speech_part': "noun"
}
}
]