Problem Description

While editing a view, I noticed that my query results change. I defined my view as :

{$addFields: {
  returnObject: {
    $regexFind: {
      input: "$Job", regex: /\[(.*)\]/    }
  }
}

But when I click "modify source" the view is now defined as:

[{$addFields: {
  returnObject: {
    $regexFind: {
      input: '$Job',
      regex: RegExp('\[(.*)\]')
    }
  }
}

This is creating a different capture in the $regexFind. This may be a server bug, but the re-writing of the query exposed this. Saving the query as a view does not cause the view definition to be re-written – it's only on modifying it. I raised SERVER-55583 to check on the syntax difference. You can see that report for raw repro.

Steps to Reproduce

Expected Results

Actual Results

Additional Notes