Issue with regex in Aggregation Pipeline within Atlas app services

Hey ya’ll,

I have an aggregation pipeline that have been tested in my VSCode playground, everything works good there, however when I try and use it in my app services functions regex can’t find a match even though there is data with the right format and totally works in vscode playground.

{
                                  case: { 
                                    $regexMatch: { 
                                      input: '$Quotemeal', 
                                      // eslint-disable-next-line prefer-regex-literals
                                      regex:  new BSON.BSONRegExp("^([1-9]|0[1-9]|1[0-2])[-/]([1-9]|0[1-9]|[12][0-9]|3[01])[-/](\d{4}|\d{2})$"),
                                    } 
                                  },
                                  then: {
                                    $let: {
                                      vars: {
                                        dateParts: { 
                                          $regexFind: { 
                                            input: '$Quotemeal', 
                                            // eslint-disable-next-line prefer-regex-literals
                                            regex: new BSON.BSONRegExp("^([1-9]|0[1-9]|1[0-2])[-/]([1-9]|0[1-9]|[12][0-9]|3[01])[-/](\d{4}|\d{2})$"),
                                          } 
                                        },
                                      },
                                      in: {
                                        dateParts: '$$dateParts'
                                        // $dateFromParts: {
                                        //   year: { $toInt: { $arrayElemAt: ['$$dateParts.captures', 2]} },
                                        //   month: { $toInt: { $arrayElemAt: ['$$dateParts.captures', 0]} },
                                        //   day: { $toInt: { $arrayElemAt: ['$$dateParts.captures', 1]} },
                                        // },
                                      },
                                    },
                                  },
                                },

I’ve added the eslint-disable and the new BSON.BSONRegExp as per a similar post I found here, because before that I only got this error back: Failed to optimize pipeline :: caused by :: $regexMatch needs ‘regex’ to be of type string or regex

Has anyone has had a similar issue when using App Services Functions?

Thank you in advance