如何在Swift中删除除竖线内内容以外的花括号及其内容？

import Foundation

func removeBracesExceptBetweenVerticalBars(in string: String) -> String {
    let pattern = "\\|[^\\|]+\\|"
    let regex = try! NSRegularExpression(pattern: pattern)
    let range = NSRange(location: 0, length: string.utf16.count)
    
    let matches = regex.matches(in: string, options: [], range: range)
    
    var result = string
    for match in matches.reversed() {
        result = result.replacingCharacters(in: Range(match.range, in: result)!, with: "")
    }
    
    return result
}

let input = "This is some {sample} text |with| braces. {Only} the content |between| vertical bars should remain."
let output = removeBracesExceptBetweenVerticalBars(in: input)
print(output)

This is some  text |with| braces.  the content |between| vertical bars should remain.