无法在Swift中获取匹配"not containing“的正则表达式

import Foundation

func getMatchesNotContaining(string: String, pattern: String) -> [String] {
    do {
        let regex = try NSRegularExpression(pattern: pattern, options: [])
        let range = NSRange(location: 0, length: string.utf16.count)
        let matches = regex.matches(in: string, options: [], range: range)
        
        var results: [String] = []
        for match in matches {
            let matchRange = match.range
            if matchRange.location == NSNotFound {
                let substring = (string as NSString).substring(with: matchRange)
                results.append(substring)
            }
        }
        
        return results
    } catch {
        print("Invalid regular expression: \(error.localizedDescription)")
        return []
    }
}

let inputString = "This is a sample string containing some text."
let pattern = "not containing"

let matches = getMatchesNotContaining(string: inputString, pattern: pattern)
print(matches)