select * from users where name like '%m%'

db.users.find({"name": /.*m.*/})

db.users.find({"name": /m/})

db.users.insert({name: 'paulo'})
db.users.insert({name: 'patric'})
db.users.insert({name: 'pedro'})

db.users.find({name: /a/})  //like '%a%'

db.users.find({name: /^pa/}) //like 'pa%'

db.users.find({name: /ro$/}) //like '%ro'

db.users.find({'name': {'$regex': 'sometext'}})

$collection->find(array('name'=> array('$regex' => 'm'));

db.collection.find( { field: /acme.*corp/i } );
//or
db.collection.find( { field: { $regex: 'acme.*corp', $options: 'i' } } );

db.collection.find( { field: new RegExp('acme.*corp') } );

db.foo.insert({desc: "This is a string with text"});
db.foo.insert({desc:"This is a another string with Text"});
db.foo.ensureIndex({"desc":"text"});
db.foo.find({
    $text:{
        $search:"text"
    }
});

db.users.find ({ "name" : /m/i } ).pretty()

var queryA = Query.And(
         Query.Matches("strName", new BsonRegularExpression("ABCD", "i")),
         Query.Matches("strVal", new BsonRegularExpression("4121", "i")));

var queryB = Query.Or(
       Query.Matches("strName", new BsonRegularExpression("ABCD","i")),
       Query.Matches("strVal", new BsonRegularExpression("33156", "i")));

var getA = collections.Find(queryA);
var getB = collections.Find(queryB);

db.myCollection.find( { $where: "this.name.toLowerCase().indexOf('m') >= 0" } );

select * from users where name like '%m%'

db.users.find({"name": /m/})     // Not JSON formatted

db.users.find({"name": /m/}).pretty()  // JSON formatted

db.users.find({'name': {'$regex': '.*sometext.*'}})

Collection.Find(bson.M{"name": bson.RegEx{"m", ""}}).All(&result)

db()->users->insert(['name' => 'john']);
db()->users->insert(['name' => 'joe']);
db()->users->insert(['name' => 'jason']);

// starts with
$like_var = 'jo';
$prefix = '/^';
$suffix = '/';
$name = $prefix . $like_var . $suffix;
db()->users->find(['name' => array('$regex'=>new MongoRegex($name))]);
output: (joe, john)

// contains
$like_var = 'j';
$prefix = '/';
$suffix = '/';
$name = $prefix . $like_var . $suffix;
db()->users->find(['name' => array('$regex'=>new MongoRegex($name))]);

output: (joe, john, jason)

var User = mongoose.model('User');

var searchQuery={};
searchQuery.email = req.query.email;
searchQuery. name = {'$regex': req.query.name};
User.find(searchQuery, function(error, user) {
                if(error || user === null) {
                    return res.status(500).send(error);
                }
                return res.status(200).send(user);
            });

String tagName = "m";
Query query = new Query();
query.limit(10);
query.addCriteria(Criteria.where("tagName").regex(tagName));

db.movies.find({title: /.*Twelve Monkeys.*/}).sort({regularizedCorRelation : 1}).limit(10);

val query = BSONDocument("title" -> BSONRegex(".*"+name+".*", "")) //like
val sortQ = BSONDocument("regularizedCorRelation" -> BSONInteger(1))
val cursor = collection.find(query).sort(sortQ).options(QueryOpts().batchSize(10)).cursor[BSONDocument]

db.users.findOne({"name" : /.*sometext.*/});

db.users.findOne({"name" : /.*sometext.*/i});