MongoDB reverse regex

Solution 1:

You can use the $where operator in the following fashion:

db.col.find({$where: "\"my regex\".match(this.regex)"})

As explained into Jira ticket provided by @fgalan on 2013, you can use $expr you can use this query:

db.collection.find({
  "$expr": {
    "$regexMatch": {
      "input": "$key",
      "regex": "$regex",
      "options": "i"
    }
  }
})

Example here

With $expr you can avoid $where which is not efficient.