JAVASCRIPT

mongodb $in regex

// Find user who has the first_name equal with "name" (case insensitive)
const users = await User.find({
	first_name: {
    	$in: [new RegExp(`^${name}$`, 'i'))]
    }
})

regex in mongo query

var search ='Neha';

db.members.find(name: new RegExp(search)) //For substring search, case sensitive. 

db.members.find(name: new RegExp('^' + search + '$')) //For exact search, case sensitive

db.members.find(name: new RegExp(search， ‘i')) //For substring search, case insensitive

db.members.find(name: new RegExp('^' +search + '$', 'i')); //For exact search, case insensitive

mongodb regex

{ <field>: { $regex: /pattern/, $options: '<options>' } }
{ <field>: { $regex: 'pattern', $options: '<options>' } }
{ <field>: { $regex: /pattern/<options> } }