如何在mongo的字符串数组中应用基于regex的替换？

db.collection.aggregate([
  {
    $project: {
      arrayField: {
        $map: {
          input: "$arrayField",
          as: "item",
          in: {
            $cond: {
              if: { $regexMatch: { input: "$$item", regex: /regex_pattern/ } },
              then: { $regexReplace: { input: "$$item", find: /regex_pattern/, replacement: "replacement_string" } },
              else: "$$item"
            }
          }
        }
      }
    }
  }
])