title: Mongo regex query for field in list of embedded objects
body: <p>i'm have a collection with records like this</p>
  
  <pre><code>&gt; db.company.findOne({companyId:1})
  {
  "_id" : ObjectId("4e22ff08eefdd839f60ab95f"),
  "lastUpdate" : ISODate("2011-07-11T17:00:00Z"),
  "errorCount" : 0,
  "house" : 49,
  "phones" : [
      {
          "cityCode" : "3852",
          "number" : "461423",
          "type" : "phone"
      },
      {
          "cityCode" : "3852",
          "number" : "461317",
          "type" : "phone"
      }
  ],
  "houseAdd" : "",
  "rubricsId" : [
      NumberLong(184108177),
      NumberLong(184108175)
  ],
  "companyId" : NumberLong(1)
  }
  </code></pre>
  
  <p>now i'm try to find all companies with phone number start with 8-800
  i'm try to search my query</p>
  
  <pre><code>db.company.find({"phones.number":/8-800.*/}
  </code></pre>
  
  <p>and get an empty list. But</p>
  
  <pre><code>db.company.find({"phones.number":/8.*/})
  </code></pre>
  
  <p>return all companies which phone numbers starts with eight.
  AFAIK '-' isn't a special char for regex in this context? I'm try regex '8\-800' with same result.  Where's i'm wrong?</p>