Searching special characters by regex does not work?

[Linh_Nguyen4 (Linh Nguyen)]

Hi,

I’ve been trying to search by regex but I can’t figure out how to use it exactly?

I created an index having a field title and this is the configuration of the index and title field.

{
  "mappings": {
    "dynamic": false,
    "fields": {
      "_id": {
        "type": "objectId"
      }
      "title": {
        "type": "string"
      }
    }
  }
}

For example, the value title is Jon test shared?
At the moment, my current query return nothing.

$search: {
      index: "default",
      regex: {
        query: "(.*)jon test(.*)",
        path: "title",
        allowAnalyzedField: true
      }
    }

Atlas search even through error when I was trying to search a special character.

$search: {
      index: "default",
      regex: {
        query: "(.*)shared\?(.*)",
        path: "title",
        allowAnalyzedField: true
      }
    }

—> Failed to run this query. Invalid pipeline

[Erik_Hatcher]

When you use ‘string’ as the field type, in your case uses lucene.standard as the analyzer, which splits (and removes) whitespace. You will need to choose a different analyzer, like lucene.keyword (note that it does not lowercase) to have the whitespace and other special characters available within a token that comes out of the analyzer.

[Linh_Nguyen4 (Linh Nguyen)]

@Erik_Hatcher Many thanks for the answer. It works for me!