public static void main(String[] args) {
        String str = " <title> 21212145424<title> 21212145424发动@#$%机雕刻家大家fdf </title> fdf </title>";
        Matcher m = Pattern.compile("<title>(?!.*?<title>).*?</title>").matcher(str);
        while(m.find()){
            System.out.println(m.group());
        }
    }

------解决方案--------------------
.*?那个"?"去掉就可以了

------解决方案--------------------
<title>[^<>]*</title>

------解决方案--------------------
Java code

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

public class TestConvert {
    public static void main(String[] args) {
    String html_line = "<title> 21212145424<title> 21212145424发动@#$%机雕刻家大家fdf </title> fdf </title>";

    String result = null;
    Pattern p = Pattern.compile(".*(<title>.*?</title>).*");//
    Matcher m = p.matcher(html_line);//开始编译
    while (m.find()) {
        result = m.group(1);//获取被匹配的部分
    }
    System.out.println(result);
    }
}

------解决方案--------------------
探讨


<title>([^<>]*)</title>