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Regex to ignore a specific character in MongoDB?
You can use regular expression along with $not operator to ignore a specific character and display rest of them. Let us first create a collection with documents −
> db.regexDemo.insertOne({"CustomerId":"Customer#1234","CustomerName":"Chris"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5cc7428f8f9e6ff3eb0ce436")
}
> db.regexDemo.insertOne({"CustomerId":"Customer5678","CustomerName":"Robert"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5cc7429e8f9e6ff3eb0ce437")
}
> db.regexDemo.insertOne({"CustomerId":"Customer#777","CustomerName":"Carol"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5cc742ae8f9e6ff3eb0ce438")
}
> db.regexDemo.insertOne({"CustomerId":"Customer777","CustomerName":"David"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5cc742bc8f9e6ff3eb0ce439")
}Following is the query to display all documents from a collection with the help of find() method −
> db.regexDemo.find().pretty();
This will produce the following output −
{
"_id" : ObjectId("5cc7428f8f9e6ff3eb0ce436"),
"CustomerId" : "Customer#1234",
"CustomerName" : "Chris"
}
{
"_id" : ObjectId("5cc7429e8f9e6ff3eb0ce437"),
"CustomerId" : "Customer5678",
"CustomerName" : "Robert"
}
{
"_id" : ObjectId("5cc742ae8f9e6ff3eb0ce438"),
"CustomerId" : "Customer#777",
"CustomerName" : "Carol"
}
{
"_id" : ObjectId("5cc742bc8f9e6ff3eb0ce439"),
"CustomerId" : "Customer777",
"CustomerName" : "David"
}Case 1 − Here is the query to avoid using a specific character in MongoDB. The character is # −
> db.regexDemo.find({CustomerId: /^[^#]*$/}).pretty();This will produce the following output −
{
"_id" : ObjectId("5cc7429e8f9e6ff3eb0ce437"),
"CustomerId" : "Customer5678",
"CustomerName" : "Robert"
}
{
"_id" : ObjectId("5cc742bc8f9e6ff3eb0ce439"),
"CustomerId" : "Customer777",
"CustomerName" : "David"
}Case 2 − Here is another query to avoid using a specific character in MongoDB. The character is # −
> db.regexDemo.find({CustomerId: {$not: /#/}}).pretty();This will produce the following output −
{
"_id" : ObjectId("5cc7429e8f9e6ff3eb0ce437"),
"CustomerId" : "Customer5678",
"CustomerName" : "Robert"
}
{
"_id" : ObjectId("5cc742bc8f9e6ff3eb0ce439"),
"CustomerId" : "Customer777",
"CustomerName" : "David"
}
Updated on: 30-Jul-2019
729 Views
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