如何用单个回车符替换多个回车符/换行符？

import re

def replace_newlines(text):
    return re.sub(r'\n+', '\n', text)

text_with_multiple_newlines = "This is a text\n\n\nwith multiple newlines."
result = replace_newlines(text_with_multiple_newlines)
print(result)

public class ReplaceNewlines {
    public static void main(String[] args) {
        String textWithMultipleNewlines = "This is a text\n\n\nwith multiple newlines.";
        String result = textWithMultipleNewlines.replaceAll("\\n+", "\n");
        System.out.println(result);
    }
}

function replaceNewlines(text) {
    return text.replace(/\n+/g, '\n');
}

var textWithMultipleNewlines = "This is a text\n\n\nwith multiple newlines.";
var result = replaceNewlines(textWithMultipleNewlines);
console.log(result);