Java正则表达式设置最小字符数

Question

我是在 java 中使用正则表达式的新手，现在在使正则表达式工作时遇到问题。
我想在字符串中保留至少3个字符，如果只有2个字符，我想删除它。

这是我的字符串:

It might be more sensible for real users if I also included a lower limit on the number of letters.

我想要的输出:

might more sensible for real users also includedlower limit the number letters.

所以，我做了一些谷歌搜索，但仍然不起作用。所以基本上这是完整的代码(1-5是我尝试过的正则表达式):

String input = "It might be more sensible for real users if I also included a lower limit on the number of letters.";
    //1. /^[a-zA-Z]{3,}$/
    //2. /^[a-zA-Z]{3,30}$/
    //3. \\b[a-zA-Z]{4,30}\\b
    //4.  ^\\W*(?:\\w+\\b\\W*){3,30}$
    //5. [+]?(?:[a-zA-Z]\\s*){3,30}

    String output = input.replaceAll("/^[a-zA-Z]{3,}$/", ""); 
    System.out.println(output);

Answer 1

你可以试试这个:

package com.stackoverflow.answer;

public class RegexTest {

    public static void main(String[] args) {
        String input = "It might be more sensible for real users if I also included a lower limit on the number of letters.";
        System.out.println("BEFORE: " + input);
        input = input.replaceAll("\\b[\\w']{1,2}\\b", "").replaceAll("\\s{2,}", " ");
        System.out.println("AFTER: " + input);
    }

}