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In Mongoose doc I didn't find an equivalent for $regex of MongoDb. Can you provide a simple Mongoose find() with a regex expression?
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Regular expression or Regex is a very important part of programming. It is usually used to find a pattern in a string.
To get all the values that contains part of a string using Mongoose find , we can use the $regex operator. Books. find({ "authors": { "$regex": "Alex", "$options": "i" } }, (err, docs) => {} );
The value of the $in operator is an array that contains few values. The document will be matched where the value of the breed field matches any one of the values inside the array.
Mongoose | findById() Function The findById() function is used to find a single document by its _id field. The _id field is cast based on the Schema before sending the command.
mongoose doc for find.
mongodb doc for regex.
var Person = mongoose.model('Person', yourSchema); // find each person with a name contains 'Ghost' Person.findOne({ "name" : { $regex: /Ghost/, $options: 'i' } }, function (err, person) { if (err) return handleError(err); console.log('%s %s is a %s.', person.name.first, person.name.last, person.occupation); }); Note the first argument we pass to mongoose.findOne function. "{ "name" : { $regex: /Ghost/, $options: 'i' } }". "name" is the field of the document you are searching. "Ghost" is the regular expression. "i" is for case insensitive match. Hope this will help you.
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