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  1. Java Driver
  2. JAVA-548

BasicDBObject does not allow to create negated regular expression

    • Type: Icon: Bug Bug
    • Resolution: Done
    • Priority: Icon: Major - P3 Major - P3
    • None
    • Affects Version/s: 2.7.2
    • Component/s: API

      To create a negating regular expression predicate I essentially need to create the following JSON query:

      { $not : /myregex/ }
      

      Unfortunately this is not possible with BasicDBObject as its toString() method (which essentially calls JSON.serialize(...)) wraps the value into quotation marks in any case which results in the following output:

      { "$not" : "/myregex/" }
      

      This is rejected by the driver with the following message:

      error: { "$err" : "invalid use of $not", "code" : 13041 }
      

      The crucial part is the value being wrapped into quotation marks. So I think the driver should not escape the value for a $not key if it is a String as it usually only works with another operator wrapped into yet another DBObject. Would be also cool if a new BasicDbObject("$not", Pattern.compile("myRegex")) would create the correct representation as well. Currently this creates:

      { $not : { $regex : "myRegex", $options : ""}}
      

      which is rejected by the driver as well.

            Assignee:
            Unassigned Unassigned
            Reporter:
            oliver.gierke Oliver Gierke
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              Created:
              Updated:
              Resolved: