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Performing regex Queries with PyMongo?
PyMongo is a Python distribution containing tools for working with MongoDB. To perform regex queries with PyMongo, the syntax is as follows −
db.yourCollectionName.find({'yourCollectionName':{'$regex':'^yourWords'}}).pretty();The above syntax will give all those documents that start from a specific word.
To understand the syntax, let us create a collection with the document. The query to create a collection with a document is as follows −
> db.performRegex.insertOne({"ClientName":"Larry","ClientFolderInformation":[
"Folder 1","Folder 2","Folder 3","Folder 4","Folder 5"], "MainFolderLocation":"/MainFolder/Details/ClientFolder" });
{
"acknowledged" : true,
"insertedId" : ObjectId("5c8a8b186cea1f28b7aa07f2")
}
> db.performRegex.insertOne({"ClientName":"Larry","ClientFolderInformation":[
"ClientFolder 1","ClientFolder 2","ClientFolder 3","ClientFolder 4","ClientFolder 5"],
"MainFolderLocation":"/MainFolder/Details/ClientFolder" });
{
"acknowledged" : true,
"insertedId" : ObjectId("5c8a8b1d6cea1f28b7aa07f3")
}Display all documents from a collection with the help of find() method. The query is as follows −
> db.performRegex.find().pretty();
The following is the output −
{
"_id" : ObjectId("5c8a8b186cea1f28b7aa07f2"),
"ClientName" : "Larry",
"ClientFolderInformation" : [
"Folder 1",
"Folder 2",
"Folder 3",
"Folder 4",
"Folder 5"
],
"MainFolderLocation" : "/MainFolder/Details/ClientFolder"
}
{
"_id" : ObjectId("5c8a8b1d6cea1f28b7aa07f3"),
"ClientName" : "Larry",
"ClientFolderInformation" : [
"ClientFolder 1",
"ClientFolder 2",
"ClientFolder 3",
"ClientFolder 4",
"ClientFolder 5"
],
"MainFolderLocation" : "/MainFolder/Details/ClientFolder"
}Here is the query to perform regex.
Case 1 − The below query gives all documents which starts from the word ‘ClientFolder’ −
> db.performRegex.find({'ClientFolderInformation':{'$regex':'^ClientFolder'}}).pretty();The following is the output −
{
"_id" : ObjectId("5c8a8b1d6cea1f28b7aa07f3"),
"ClientName" : "Larry",
"ClientFolderInformation" : [
"ClientFolder 1",
"ClientFolder 2",
"ClientFolder 3",
"ClientFolder 4",
"ClientFolder 5"
],
"MainFolderLocation" : "/MainFolder/Details/ClientFolder"
}Case 2 − The below query gives all documents which starts from word ‘Folder’ −
> db.performRegex.find({'ClientFolderInformation':{'$regex':'^Folder'}}).pretty();The following is the output −
{
"_id" : ObjectId("5c8a8b186cea1f28b7aa07f2"),
"ClientName" : "Larry",
"ClientFolderInformation" : [
"Folder 1",
"Folder 2",
"Folder 3",
"Folder 4",
"Folder 5"
],
"MainFolderLocation" : "/MainFolder/Details/ClientFolder"
}
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