问如何在基于SWIFT5.2的RegEx中添加非贪婪的搜索标志修饰符

EN

// WARNING: You included a flag that Swift doesn't support: U
//          When this flag is set, it inverts the "greediness" of the quantifiers so that they are not greedy by default, but become greedy if followed by '?'.
//          As an alternative, this effect can also be achieved by setting a (?U) modifier setting within the pattern or by a question mark behind a quantifier (e.g. .*?).

import Foundation

// WARNING: You included a flag that Swift doesn't support: U
//          When this flag is set, it inverts the "greediness" of the quantifiers so that they are not greedy by default, but become greedy if followed by '?'.
//          As an alternative, this effect can also be achieved by setting a (?U) modifier setting within the pattern or by a question mark behind a quantifier (e.g. .*?).

let pattern = #"(- examples: \[\{(.*[\n])*).*?(?:\}\}\]$)"#
let regex = try! NSRegularExpression(pattern: pattern, options: .anchorsMatchLines)
let testString = #"""
    /**
     Gets a list of custom fields.
     - GET
     - OAuth:
       - name:
     - examples: [{contentType=application/json, example={
  "s" : [ {
    "name" : "name",
  }, {
    "name" : "name",
  } ],
  "fields" : [ {
    "items" : [ "listItems", "listItems" ],
    "name" : "name",
      "message" : "message"
    },
  }, {
    "items" : [ "listItems", "listItems" ],
    "name" : "name",
  } ]
}}]
     - returns: Request<Fields>
     */

    /**
     Gets a
     - examples: [{contentType=application/json, example={
  "fields" : [ {
    "name" : "name",
  } ],
  "fields" : [ {
    "listItems" : [ "listItems", "listItems" ],
    "name" : "name",
  } ]
}}]
     - returns: Request<fields>
     */
"""#
let stringRange = NSRange(location: 0, length: testString.utf16.count)
let matches = regex.matches(in: testString, range: stringRange)
var result: [[String]] = []
for match in matches {
    var groups: [String] = []
    for rangeIndex in 1 ..< match.numberOfRanges {
        let nsRange = match.range(at: rangeIndex)
        guard !NSEqualRanges(nsRange, NSMakeRange(NSNotFound, 0)) else { continue }
        let string = (testString as NSString).substring(with: nsRange)
        groups.append(string)
    }
    if !groups.isEmpty {
        result.append(groups)
    }
}
print(result)

- examples: [{contentType=application/json, example={
  "s" : [ {
    "name" : "name",
  }, {
    "name" : "name",
  } ],
  "fields" : [ {
    "items" : [ "listItems", "listItems" ],
    "name" : "name",
      "message" : "message"
    },
  }, {
    "items" : [ "listItems", "listItems" ],
    "name" : "name",
  } ]
}}]