MongoDB Regex Like Query pattern – II
Today in this article, we shall see how to write MongoDB Regex Like query ( resembles SQL ‘like’ query) using regex pattern with case sensitive and insensitive search with examples.
Today in this article, we will cover below aspects,
I shall be explaining the queries using the like query in MongoDB Shell. If you are interested to refer a mongo query without Regex, please refer to the article below,
I have a sample MongoDB document below in one of the collections. Here we shall be trying to search all the documents using a MongoDB-like query
[
{
"_id": "5db5a4476997188b2722c820",
"Name": "Design Patterns",
"Price": 54.93,
"Category": "Computers",
"Author": "Ralph Johnson"
},
{
"_id": "5ff50353a29ce9564c2724e2",
"Name": "Design Patterns",
"Price": 54.93,
"Category": "Computers",
"Author": "Mike Casper"
},
{
"_id": "5ff503cda29ce9564c2724e3",
"Name": "Design Patterns",
"Price": 54.93,
"Category": "Computers",
"Author": "TheCodeBuzz"
}
{
"_id": "45b5a4476543188b2722c34550",
"Name": "Design Patterns- II",
"Price": 60.93,
"Category": "Computers",
"Author": "Ralph johnson"
},
]
Scenarios 1 – MongoDB Regex Query with Like
Let’s build MongoDB-like query using a regex for getting Author names where the name contains a word like “J” or “j” for the Author field.
Assumptions:
“J” or “j” could be contained at the start or last or in the middle or anywhere else of Author names.
Query pattern
MongoDB regex query with case-sensitive search
{ Field Name: {'$regex' : 'string'}}
MongoDB regex query with case insensitive search
{ Field Name: {'$regex' : 'string', '$options' : 'i'}}
Example Query 1
db.Books.find({Author:{'$regex' : 'J'}})
Mongo Query Result :
db.Books.find({Author:{'$regex' : 'J'}})
{ "_id" : ObjectId("5db5a4476997188b2722c820"), "Name" : "Design Patterns", "Price" : 54.93, "Category" : "Computers", "Author" : "Ralph Johnson" }
{ "_id" : ObjectId("5ff503cda29ce9564c2724e3"), "Name" : "Code Refactoring", "Price" : 43.15, "Category" : "Computers", "Author" : "Julia Robert" }
db.Books.find({Author:{'$regex' : 'j'}})
{ "_id" : ObjectId("5f34a2430c3ca98a8c9052d2"), "Name" : "Design Patterns", "Price" : 54.93, "Category" : "Computers", "Author" : "Ralph johnson" }
Example Query 2 – Case insensitive
Let’s now use case insensitive query using $options,
{ Author:{'$regex' : 'J', '$options' : 'i'}
Mongo Query Result :
Below is the query for like in MongoDB
> db.Books.find({Author:{'$regex' : 'J', '$options' : 'i'}})
{ "_id" : ObjectId("5db5a4476997188b2722c820"), "Name" : "Design Patterns", "Price" : 54.93, "Category" : "Computers", "Author" : "Ralph Johnson" }
{ "_id" : ObjectId("5f34a2430c3ca98a8c9052d2"), "Name" : "Design Patterns", "Price" : 54.93, "Category" : "Computers", "Author" : "Ralph johnson" }
{ "_id" : ObjectId("5ff503cda29ce9564c2724e3"), "Name" : "Code Refactoring", "Price" : 43.15, "Category" : "Computers", "Author" : "Julia Robert" }
Scenarios 2 – MongoDB Regex Query with ‘Like’ that start with criteria
Let’s build a query to get the list of items that start with some search criteria. Example “Ro” for Author field.
Query pattern
{ Field Name : /^Ro/ }
Where Ro is your search cretieria.
Example Query
{ Author :{'$regex' : '^Ro', '$options' : 'i'}})
Search Result:
Scenarios 3 – Regex End with match Mongo Query
Let’s build a query to Get the list of items that ends with some search criteria. Example “rt” for Author field
Query pattern
{ Field Name : { ‘$regex’ : ‘robert$’ , ‘$options’ : ‘i’ } }
Where ‘robert’ is your search criteria
Example Query
{ Author :{'$regex' : 'robert$', '$options' : 'i'}}
Mongo Shell results,
> db.Books.find({ Author :{'$regex' : 'robert$', '$options' : 'i'}})
{ "_id" : ObjectId("5ff503cda29ce9564c2724e3"), "Name" : "Code Refactoring", "Price" : 43.15, "Category" : "Computers", "Author" : "Julia Robert" }
Above query, we have Author “Julia Robert” that matches with search criteria.
Scenarios 4 – Regex Exact Match Mongo Query
Let’s look into Regex Exact Match Mongo Query.
Query pattern
{ Field Name : { ‘$regex’ : ‘robert$’ , ‘$options’ : ‘i’ } }
Where ‘robert’ is your search criteria
Example Query:
{ Author :{'$regex' : '^julia robert$', '$options' : 'i'}}
Where ‘julia robert’ is our exact search criteria. Here Author field value has to match exactly (but case insensitive )
Mongo Shell results,
> db.Books.find({ Author :{'$regex' : 'robert$', '$options' : 'i'}})
{ "_id" : ObjectId("5ff503cda29ce9564c2724e3"), "Name" : "Code Refactoring", "Price" : 43.15, "Category" : "Computers", "Author" : "Julia Robert" }
Above query, we have Author “Julia Robert” that matches with exact search criteria.
References:
Do you have any comments or ideas or any better suggestions to share?
Please sound off your comments below.
Happy Coding !!
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