Java 使用\\ b匹配单词边界以获取\ b

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public class Main {

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  public static void main(String[] args) {

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

    /*

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    */

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    String regex = "\\bapple\\b";

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    String replacementStr = "orange";

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

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

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

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

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