title: Querying for output address using regex and tx time range
body: <p><code>qqqqqqqqqqqqqqqqqqqqqqqqqqqqqu08dsyxz98whc</code> is one out of possibly many tx which have <code>whc</code> substring in output address,</p>
  
  <p><a href="https://blockchair.com/bitcoin-cash/transaction/ce4b6388c3b57dc188bfafde87d7af28ee3ba210d0a3223a3bc86f6083337459" rel="nofollow noreferrer">https://blockchair.com/bitcoin-cash/transaction/ce4b6388c3b57dc188bfafde87d7af28ee3ba210d0a3223a3bc86f6083337459</a></p>
  
  <p>I would like to find such outputs for <code>2018-08</code> using bitdb query lang similar to mongodb,</p>
  
  <pre><code>{
    "v": 3,
    "q": {
      "find": {
        "out.e.a": { "$regex": "whc$" },
        "blk.t": {
          "$gte": "2018-08-01T00:00:00Z",
          "$lte": "2018-08-31T00:00:00Z"
        }
      },
      "limit": 1
    }
  }
  </code></pre>
  
  <p>Unfortunately I'm not getting any result for such <a href="https://bitdb.network/v3/explorer/ewogICJ2IjogMywKICAicSI6IHsKICAgICJmaW5kIjogewogICAgICAib3V0LmUuYSI6IHsgIiRyZWdleCI6ICJ3aGMkIiB9LAogICAgICAiYmxrLnQiOiB7CiAgICAgICAgIiRndGUiOiAiMjAxOC0wOC0wMVQwMDowMDowMFoiLAogICAgICAgICIkbHRlIjogIjIwMTgtMDgtMzFUMDA6MDA6MDBaIgogICAgICB9CiAgICB9LAogICAgImxpbWl0IjogMQogIH0KfQ==" rel="nofollow noreferrer">query</a>
  Is there some syntax issue which prevents correct results?</p>