使用\\ b匹配单词边界以获取\ b

public class Main {

  public static void main(String[] args) {

    // Prepare regular expression. Use \\b to get \b inside the string.
    /*
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    */

    String regex = "\\bapple\\b";

    String replacementStr = "orange";

    String inputStr = "I have an apple and five pineapples";

    String newStr = inputStr.replaceAll(regex, replacementStr);


    System.out.println("Regular Expression: " + regex);

    System.out.println("Input String: " + inputStr);

    System.out.printl