-----wxc-----\n你好\n----wxc----- 用Java把你好提取出来

要使用Java将字符串中的"你好"提取出来，你可以使用正则表达式。你可以使用以下代码来实现：

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class HelloWorldExtractor {
    public static void main(String[] args) {
        String input = "-----wxc-----\n你好\n----wxc-----";
        String pattern = "你好";

        Pattern regex = Pattern.compile(pattern);
        Matcher matcher = regex.matcher(input);

        if (matcher.find()) {
            String extractedString = matcher.group(); // 提取匹配的字符串
            System.out.println(extractedString);
        } else {
            System.out.println("未找到匹配的字符串");
        }
    }
}

以上代码使用了正则表达式模式"你好"来匹配输入字符串，并从中提取出匹配的字符串。如果找到匹配的字符串，就会打印它；如果未找到匹配的字符串，则会打印"未找到匹配的字符串"。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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