How to check a String in a set (Find_IN_SET) using MongoDB Java

I am working on a web-services code in MongoDB using Java ,I have a table where one of the column contains range values like 1,2,3 or 3,4,5 or 6,7,8 . Given a value like 2 , I have to check whether the value lies in each of the specified ranges I tried the following query in MYSQL

select * from Table where FIND_IN_SET('2',RangeField)

and the java code i have tried is

BasicDBObject whereQuery = new BasicDBObject();
whereQuery.put("RangeField","2");
DBCursor cursor = col.find(whereQuery);

I don't have any idea about the right syntax to define find_in_set in Mongo Java. RangeField is String in table and its like 1,2,3 or 3f,5f. How to replicate the same in mondoDB java code

Thanks

You can use regex to get all the records which contains search string.

In MongoDB :

db.Table.find({"RangeField":{$regex:"2"}}); //List records which contain 2 anywhere

In Java :

BasicDBObject dbObject = new BasicDBObject();
dbObject.put("RangeField",  java.util.regex.Pattern.compile("2"));
try(DBCursor cursor = collection.find(dbObject))
{
    while (cursor.hasNext())
    {
        System.out.println((BasicDBObject) cursor.next());
    }
}