|
|
相关文章推荐
|
爱喝酒的刺猬 · USA奥特曼形象变化历程：美女奥特曼贝斯颜值 ...· 2 月前 · |
|
|
拉风的黄瓜 · 诺基亚世界大会2011：Windows ...· 5 月前 · |
|
|
要出家的吐司 · 中华人民共和国传染病防治法-· 1 年前 · |
|
|
愉快的铁链 · MSU Denver Institute ...· 1 年前 · |
|
|
宽容的水煮肉 · 《欢迎来到实力至上主义的教室第二季》更新至第 ...· 1 年前 · |
-
DSA
- Data Structures
-
Algorithms
- Analysis of Algorithms
- Searching Algorithms
- Sorting Algorithms
- Greedy Algorithms
- Dynamic Programming
- Graph Algorithms
- Pattern Searching
- Recursion
- Backtracking
- Divide and Conquer
- Mathematical Algorithms
- Geometric Algorithms
- Bitwise Algorithms
- Randomized Algorithms
- Branch and Bound
- Algorithms Tutorial
- DSA Tutorial
- Competitive Programming
- Company Wise SDE Sheets
- DSA Cheat Sheets
- Top Interview Questions
- Puzzles
-
Tutorials
-
Python Tutorial
- Taking Input in Python
- Python Operators
- Python Data Types
- Python Loops and Control Flow
- Python Functions
- Python OOPS Concept
- Python Data Structures
- Python Exception Handling
- Python File Handling
- Python Exercises
-
Web Development In Python
- Django
- Django Database
- Django CRUD
- Django Forms
- Django Static File
- Projects for Beginners
- Django Interview Questions
- Django Tutorial
- Flask
- Frontend Projects
- Postman
- Github
-
Java
-
Java Programming Language
- Java Tutorial
- Data Types
- Variables
- Operators
- Flow Control in Java
- Loops in Java
- Methods
- Strings
- Arrays
- OOPs Concepts
- Interface
- Packages
- Multithreading
- File Handling
- Regular Expression
- Java Collections
- Java 8 Tutorial
- Java Programs
- Java Interview Questions
- Java Exercises
- Java Quiz
- Java Projects
- Advance Java
-
Java Programming Language
- Programming Languages
-
System Design
-
System Design Tutorial
- What is System Design
- Key Terminologies in System Design
- Analysis and Architecture of Systems
- Scalability in System Design
- Databases in System Design
- High Level Design or HLD
- Low Level Design or LLD
- Communication Protocols
- Web Servers and Proxies
- Case Studies in Designing Systems
- Complete System Design Tutorial
- Software Design Patterns
- System Design Roadmap
- Top 10 System Design Interview Questions and Answers
-
System Design Tutorial
- Interview Corner
- Computer Science Subjects
- DevOps
- Linux
-
Software Testing
- Software Testing Tutorial
- Testing Tools
- Selenium
- Jira
- Software Engineering
- Interview Questions
- Postman
- Databases
- Android
- Excel
- Mathematics
- Commerce
- SEO-Search Engine Optimization
- Aptitude
-
Python Tutorial
-
Data Science
- Python Tutorial
- R Tutorial
- Machine Learning
- Data Science using Python
- Data Science using R
- Data Science Packages
- Data Visualization
- Data Analysis
- Deep Learning
- NLP Tutorial
- Web Tech
- MongoDB Tutorial
- MongoDB Insert() Method - db.Collection.insert()
- MongoDB insertOne() Method - db.Collection.insertOne()
- MongoDB insertMany() Method - db.Collection.insertMany()
- MongoDB - Bulk.insert() Method
- MongoDB - db.collection.bulkWrite() Method
- MongoDB - Update() Method
- MongoDB updateOne() Method - db.Collection.updateOne()
- MongoDB updateMany() Method - db.Collection.updateMany()
- MongoDB - db.collection.Find() Method
- MongoDB - FindAndModify() Method
- MongoDB - FindOne() Method
- MongoDB - findOneAndDelete() Method
- MongoDB - db.collection.findOneAndReplace() Method
- MongoDB - db.collection.findOneAndUpdate() Method
- MongoDB - sort() Method
- MongoDB - copyTo() Method
- MongoDB count() Method - db.Collection.count()
- MongoDB - countDocuments() Method
- MongoDB - Drop Collection
- MongoDB Remove() Method - db.Collection.remove()
- MongoDB - db.collection.deleteone()
- MongoDB - Distinct() Method
- MongoDB - limit() Method
- MongoDB - skip() Method
- MongoDB | ObjectID() Function
- MongoDB - db.collection.CreateIndex() Method
- MongoDB - db.collection.createIndexes() Method
- MongoDB - getIndexes() Method
- MongoDB - dropIndex() Method
- MongoDB - dropIndexes() Method
- MongoDB - Comparison Query Operators
- MongoDB $cmp Operator
- MongoDB - Greater than Operator $gt
- MongoDB - Less than Operator $lt
- MongoDB - Equality Operator $eq
- MongoDB - Less than equals to Operator $lte
- MongoDB - Greater than equals to Operator $gte
- MongoDB - Inequality Operator $ne
- MongoDB $in Operator
- MongoDB - $nin Operator
- MongoDB $add Operator
- MongoDB $subtract Operator
- MongoDB $multiply Operator
- MongoDB $divide Operator
- MongoDB $abs operator
- MongoDB $floor Operator
- MongoDB $ceil Operator
- MongoDB $mod Operator
- MongoDB $sqrt Operator
- MongoDB $pow Operator
- MongoDB $exp Operator
- MongoDB $log Operator
- MongoDB $log10 Operator
- MongoDB $ln Operator
- MongoDB - Field Update Operators
- MongoDB - Maximum operator ( $max )
- MongoDB - Minimum operator ( $min )
- MongoDB - Increment Operator ( $inc )
- MongoDB - Multiply Operator ($mul)
- MongoDB - Rename Operator ($rename)
- MongoDB - Current Date Operator ($currentDate)
- MongoDB - SetOnInsert Operator ($setOnInsert)
- MongoDB Bitwise Update Operator
- MongoDB - $pull Operator
- MongoDB - $pop Operator
- MongoDB - $pullAll Operator
- MongoDB - $push Operator
- MongoDB - Positional Operator ($)
- MongoDB - All Positional Operator ($[])
- MongoDB - $position Modifier
- MongoDB - $addToSet Operator
- MongoDB - $each Modifier
- MongoDB - $sort Modifier
- MongoDB - $slice Modifier
- Defining, Creating and Dropping a MongoDB collection
- Adding and Querying the data in MongoDB
- How to Create Database & Collection in MongoDB?
- MongoDB - Query Documents using Mongo Shell
- MongoDB - Insert Single Document Using MongoShell
- MongoDB - Insert Multiple Document Using MongoShell
- MongoDB - Update Single Document Using MongoShell
- MongoDB - Update Multiple Documents Using MongoShell
- MongoDB - Replace Documents Using MongoShell
- MongoDB - Delete Single Document Using MongoShell
- MongoDB - Delete Multiple Documents Using MongoShell
- MongoDB - Check the existence of the fields in the specified collection
- Sorting Documents in MongoDB
- Capped Collections in MongoDB
- Create Relationship in MongoDB
- Search Text in MongoDB
- MongoDB - Map Reduce
- Upsert in MongoDB
- Export data from MongoDB
- Import data to MongoDB
- MongoDB - Regex
- MongoDB Projection
- MongoDB - Embedded Documents
- MongoDB - Query Embedded Documents Using Mongo Shell
- Aggregation in MongoDB
- How to Enable Authentication on MongoDB ?
- Create user and add role in MongoDB
- MongoDB - Replication and Sharding
- MongoDB - Backup and Restoration
- MongoDB Tutorial
- MongoDB Insert() Method - db.Collection.insert()
- MongoDB insertOne() Method - db.Collection.insertOne()
- MongoDB insertMany() Method - db.Collection.insertMany()
- MongoDB - Bulk.insert() Method
- MongoDB - db.collection.bulkWrite() Method
- MongoDB - Update() Method
- MongoDB updateOne() Method - db.Collection.updateOne()
- MongoDB updateMany() Method - db.Collection.updateMany()
- MongoDB - db.collection.Find() Method
- MongoDB - FindAndModify() Method
- MongoDB - FindOne() Method
- MongoDB - findOneAndDelete() Method
- MongoDB - db.collection.findOneAndReplace() Method
- MongoDB - db.collection.findOneAndUpdate() Method
- MongoDB - sort() Method
- MongoDB - copyTo() Method
- MongoDB count() Method - db.Collection.count()
- MongoDB - countDocuments() Method
- MongoDB - Drop Collection
- MongoDB Remove() Method - db.Collection.remove()
- MongoDB - db.collection.deleteone()
- MongoDB - Distinct() Method
- MongoDB - limit() Method
- MongoDB - skip() Method
- MongoDB | ObjectID() Function
- MongoDB - db.collection.CreateIndex() Method
- MongoDB - db.collection.createIndexes() Method
- MongoDB - getIndexes() Method
- MongoDB - dropIndex() Method
- MongoDB - dropIndexes() Method
- MongoDB - Comparison Query Operators
- MongoDB $cmp Operator
- MongoDB - Greater than Operator $gt
- MongoDB - Less than Operator $lt
- MongoDB - Equality Operator $eq
- MongoDB - Less than equals to Operator $lte
- MongoDB - Greater than equals to Operator $gte
- MongoDB - Inequality Operator $ne
- MongoDB $in Operator
- MongoDB - $nin Operator
- MongoDB $add Operator
- MongoDB $subtract Operator
- MongoDB $multiply Operator
- MongoDB $divide Operator
- MongoDB $abs operator
- MongoDB $floor Operator
- MongoDB $ceil Operator
- MongoDB $mod Operator
- MongoDB $sqrt Operator
- MongoDB $pow Operator
- MongoDB $exp Operator
- MongoDB $log Operator
- MongoDB $log10 Operator
- MongoDB $ln Operator
- MongoDB - Field Update Operators
- MongoDB - Maximum operator ( $max )
- MongoDB - Minimum operator ( $min )
- MongoDB - Increment Operator ( $inc )
- MongoDB - Multiply Operator ($mul)
- MongoDB - Rename Operator ($rename)
- MongoDB - Current Date Operator ($currentDate)
- MongoDB - SetOnInsert Operator ($setOnInsert)
- MongoDB Bitwise Update Operator
- MongoDB - $pull Operator
- MongoDB - $pop Operator
- MongoDB - $pullAll Operator
- MongoDB - $push Operator
- MongoDB - Positional Operator ($)
- MongoDB - All Positional Operator ($[])
- MongoDB - $position Modifier
- MongoDB - $addToSet Operator
- MongoDB - $each Modifier
- MongoDB - $sort Modifier
- MongoDB - $slice Modifier
- Defining, Creating and Dropping a MongoDB collection
- Adding and Querying the data in MongoDB
- How to Create Database & Collection in MongoDB?
- MongoDB - Query Documents using Mongo Shell
- MongoDB - Insert Single Document Using MongoShell
- MongoDB - Insert Multiple Document Using MongoShell
- MongoDB - Update Single Document Using MongoShell
- MongoDB - Update Multiple Documents Using MongoShell
- MongoDB - Replace Documents Using MongoShell
- MongoDB - Delete Single Document Using MongoShell
- MongoDB - Delete Multiple Documents Using MongoShell
- MongoDB - Check the existence of the fields in the specified collection
- Sorting Documents in MongoDB
- Capped Collections in MongoDB
- Create Relationship in MongoDB
- Search Text in MongoDB
- MongoDB - Map Reduce
- Upsert in MongoDB
- Export data from MongoDB
- Import data to MongoDB
- MongoDB - Regex
- MongoDB Projection
- MongoDB - Embedded Documents
- MongoDB - Query Embedded Documents Using Mongo Shell
- Aggregation in MongoDB
- How to Enable Authentication on MongoDB ?
- Create user and add role in MongoDB
- MongoDB - Replication and Sharding
- MongoDB - Backup and Restoration
- With $regex Operator
- Without $regex Operator
- You are not allowed to use $regex operator inside $in operator.
- If you want to add a regular expression inside a comma-separated list of a query condition, then you have to use the $regex operator.
- If you want to use x and s options then you have to use $regex operator expression with $options.
- Starting from the latest version of MongoDB(i.e., 4.0.7) you are allowed to use $not operator with $regex operator expression.
- For case-sensitive regular expression queries, if the index of the specified field is available, then MongoDB matches the regular expression to the values in the index. It is the easiest way to match rather than scanning all the collections For case-insensitive regular expression queries, they do not utilize index effectively.
- If you want to use Perl compatible regular expressions support regular expressions that are not supported in JavaScript, then you must use $regex operator.
- i: To match both lower case and upper case pattern in the string.
- m: To include ^ and $ in the pattern in the match i.e. to specifically search for ^ and $ inside the string. Without this option, these anchors match at the beginning or end of the string.
- x: To ignore all white space characters in the $regex pattern.
- s: To allow the dot character “.” to match all characters including newline characters.
- Displaying details of employee who are having the word developer in their position field:
- Displaying details of employee who are a software engineer with case insensitive by using i <options>:
- Displaying details of the employee whose name starts with B:
- Displaying details of the employee whose name ends with e:
- Displaying details of employee who are having the word “te” in their name by using regular expression object:
- Company
- About Us
- Legal
- Careers
- In Media
- Contact Us
- Advertise with us
- GFG Corporate Solution
- Placement Training Program
- Apply for Mentor
- Explore
- Job-A-Thon Hiring Challenge
- Hack-A-Thon
- GfG Weekly Contest
- Offline Classes (Delhi/NCR)
- DSA in JAVA/C++
- Master System Design
- Master CP
- GeeksforGeeks Videos
- Geeks Community
- DSA
- Data Structures
- Algorithms
- DSA for Beginners
- Basic DSA Problems
- DSA Roadmap
- Top 100 DSA Interview Problems
- DSA Roadmap by Sandeep Jain
- All Cheat Sheets
- Python
- Python Programming Examples
- Django Tutorial
- Python Projects
- Python Tkinter
- Web Scraping
- OpenCV Python Tutorial
- Python Interview Question
- Computer Science
- GATE CS Notes
- Operating Systems
- Computer Network
- Database Management System
- Software Engineering
- Digital Logic Design
- Engineering Maths
- Competitive Programming
- Top DS or Algo for CP
- Top 50 Tree
- Top 50 Graph
- Top 50 Array
- Top 50 String
- Top 50 DP
- Top 15 Websites for CP
- School Subjects
- Mathematics
- Physics
- Chemistry
- Biology
- Social Science
- English Grammar
- UPSC Study Material
- Polity Notes
- Geography Notes
- History Notes
- Science and Technology Notes
- Economy Notes
- Ethics Notes
- Previous Year Papers
- Companies
- META Owned Companies
- Alphabhet Owned Companies
- TATA Group Owned Companies
- Reliance Owned Companies
- Fintech Companies
- EdTech Companies
- Preparation Corner
- Company-Wise Recruitment Process
- Resume Templates
- Aptitude Preparation
- Puzzles
- Company-Wise Preparation
- Exams
- JEE Mains
- JEE Advanced
- GATE CS
- NEET
- UGC NET
- More Tutorials
- Software Development
- Software Testing
- Product Management
- SAP
- SEO - Search Engine Optimization
- Linux
- Excel
Introduction
Installation
Basics of MongoDB
MongoDB Methods
Comparison Operators
Logical Operators
Arithmetic Operators
Field Update Operators
Array Expression Operators
Array Update Operators
String Expression Operators
Working with Documents and Collections
Indexing in MongoDB
MongoDB Advance
Introduction
Installation
Basics of MongoDB
MongoDB Methods
Comparison Operators
Logical Operators
Arithmetic Operators
Field Update Operators
Array Expression Operators
Array Update Operators
String Expression Operators
Working with Documents and Collections
Indexing in MongoDB
MongoDB Advance
MongoDB provides the functionality to search a pattern in a string during a query by writing a regular expression . A regular expression is a generalized way to match patterns with sequences of characters. MongoDB uses Perl compatible regular expressions(PCRE) version 8.42 along with UTF-8 support. In MongoDB, we can do pattern matching in two different ways:
Pattern matching using $regex operator
This operator provides regular expression capabilities for pattern matching stings in the queries. Or in other words, this operator is used to search for the given string in the specified collection. It is helpful when we don’t know the exact field value that we are looking in the document. For example, a collection containing 3 documents i.e.,
name: "Tony",
position: "Backend developer"
name: "Bruce",
position: "frontend developer"
name: "Nick",
position: "HR Manager"
Last Updated : 15 Jun, 2023 Like Article
@GeeksforGeeks, Sanchhaya Education Private Limited
,
All rights reserved
We use cookies to ensure you have the best browsing experience on our website. By using our site, you
acknowledge that you have read and understood our
Cookie Policy
&
Privacy Policy
Got It !
and we are looking for developer information. So, with the help of the $regex operator, we create a pattern(i.e., {position: {$regex: “developer”}}) that will return only those documents that contain developer string.
Important Points:
Syntax:
{ <field>: { $regex: /pattern/, $options: '<options>' } }
{ <field>: { $regex: 'pattern', $options: '<options>' } }
$options:
In MongoDB, the following <options> are available for use with regular expression:
Examples:
In the following examples, we are working with:
Database: GeeksforGeeks
Collection: employee
Documents: Six documents that contain the details of the employees in the form of field-value pairs.
db.employee.find({position : {$regex : "developer"}}).pretty()
Here, we are displaying the documents of those employees whose position field contain developer string. So we pass a regular expression using $regex operator(i.e. {$regex : “developer”}) for the position field in the find() method.
db.employee.find({position:{$regex:"software",$options:"i"}}).pretty()
Here, we are displaying the documents of those employees whose position field contain case-insensitive “software” string. So, we pass a regular expression with option(i.e., {$regex : “software”, $options: “$i”}) for the position field in the find() method. In the regular expression, $options:”$i” is used to match both lower case and upper case pattern in the given string(i.e., “software”).
db.employee.find({Name:{$regex:"^B"}}).pretty()
Here, we are displaying the documents of those employees whose name starts with ‘B’ letter. So, we pass a regular expression using $regex operator(i.e. {$regex : “^B”}) for the Name field in the find() method.
db.employee.find({Name:{$regex:"e$"}}).pretty()
Here, we are displaying the documents of those employees whose names end with the ‘e’ letter. So, we pass a regular expression using $regex operator(i.e. {$regex : “e$”}) for the Name field in the find() method.
db.employee.find({Name: /te/}).pretty()
Here, we are displaying the documents of those employees whose names contain the “te” string. So, we pass a regular expression(i.e., {Name: /te/}) for the Name field in the find() method. In this regular expression, // means to specify your search criteria in between these delimiters, i.e., /te/.
Whether you're preparing for your first job interview or aiming to upskill in this ever-evolving tech landscape, GeeksforGeeks Courses are your key to success. We provide top-quality content at affordable prices, all geared towards accelerating your growth in a time-bound manner. Join the millions we've already empowered, and we're here to do the same for you. Don't miss out - check it out now !
Looking for a place to share your ideas, learn, and connect? Our Community portal is just the spot! Come join us and see what all the buzz is about!
Last Updated : 15 Jun, 2023 Like Article
Please go through our recently updated
Improvement Guidelines
before submitting any improvements.
This article is being improved by another user right now.
You can suggest the changes for now and it will be under the article's discussion tab.
You will be notified via email once the article is available for improvement.
Thank you for your valuable feedback!
Please go through our recently updated
Improvement Guidelines
before submitting any improvements.
Suggest Changes
Help us improve. Share your suggestions to enhance the article. Contribute your expertise and make a difference in the GeeksforGeeks portal.
推荐文章
|
|
要出家的吐司 · 中华人民共和国传染病防治法- 1 年前 |