Question

import java.util.*;
public class ReplaceString {
    public static void main(String[] args) {
        new ReplaceString().run();
    }

    public void run()
    {

        System.out.println("Input String:\n");
        Scanner keyboardScanner = new Scanner(System.in);
        String inString = keyboardScanner.nextLine();
        String strOutput = inString.replace("is","was");
        System.out.println(strOutput);      

    }
}

我正在尝试用输入的行替换所有出现的“is”和“was”，我能够做到这一点，但我不想弄乱“is”是单词的一部分。< / p>

例如，任何出现的单词名称都应该被忽略。只有“是”的个别出现应该用“是”替换

我知道我可以使用正则表达式，但我不知道格式是否正则表达式

Answer 1

尝试

 String strOutput = inString.replaceAll("\\bis\\b","was");

reference link

测试输出：

Input String:

is island is feris kiss

输出

was island was feris kiss

Answer 2

不是我对java了解多少，但你可以尝试添加空格。理论上应该有效。

System.out.println("Input String:\n");
Scanner keyboardScanner = new Scanner(System.in);
String inString = keyboardScanner.nextLine();
String strOutput = inString.replace(" is "," was ");
System.out.println(strOutput);

替换字符串java Scanner类

2 个答案: