java java替换所有()

声明:本页面是StackOverFlow热门问题的中英对照翻译,遵循CC BY-SA 4.0协议,如果您需要使用它,必须同样遵循CC BY-SA许可,注明原文地址和作者信息,同时你必须将它归于原作者(不是我):StackOverFlow 原文地址: http://stackoverflow.com/questions/1092416/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me): StackOverFlow

提示:将鼠标放在中文语句上可以显示对应的英文。显示中英文
时间:2020-10-29 15:09:13  来源:igfitidea点击:

java replaceAll()

javastring

提问by penguru

What is the regular expression for replaceAll()function to replace "N/A" with "0" ?

replaceAll()用“0”替换“N/A”的函数的正则表达式是什么?

input : N/A
output : 0

输入:N/A
输出:0

回答by cletus

Assuming s is a String.

假设 s 是String

s.replaceAll("N/A", "0");

You don't even need regular expressions for that. This will suffice:

你甚至不需要正则表达式。这就足够了:

s.replace("N/A", "0");

回答by Jon Skeet

Why use a regular expression at all? If you don't need a pattern, just use replace:

为什么要使用正则表达式?如果您不需要模式,只需使用replace

String output = input.replace("N/A", "0");

回答by Koss

You can try a faster code. If the string contains only N/A:

您可以尝试更快的代码。如果字符串仅包含 N/A:

return str.equals("N/A") ? "0" : str;

if string contains multiple N/A:

如果字符串包含多个 N/A:

return join(string.split("N/A"), "0")
            + (string.endsWith("N/A") ? "0" : "");

where join()is method:

其中join()是方法:

private String join(String[] split, String string) {
    StringBuffer s = new StringBuffer();
    boolean isNotFirst = false;
    for (String str : split) {
        if (isNotFirst) {
            s.append(string);
        } else {
            isNotFirst = true;
        }
        s.append(str);
    }
    return s.toString();
}

it is twice as fast

它的速度是原来的两倍