文件名如下： file:///storage/emulated/0/SHAREit/videos/Dangerous_Hero_(2017)____Latest_South_Indian_Full_Hindi_Dubbed_Movie___2017_.mp4 file:///storage/emulated/0/VidMate/download/%E0%A0_-Promo_Songs-Khiladi-Khesari_Lal-_Bho.mp4 file:///storage/emulated/0/WhatsApp/Media/WhatsApp%20Video/VID-20171222-WA0015.mp4 file:///storage/emulated/0/bluetooth/%5DChitaChola%7B%7D%D8%B9%D8%A7%D9%85%D8%B1%24%20.3gp 我想编写hive regex来从每个字符串中提取单词。
例如，在第一个字符串中，输出应该是：storage，simulated，。。。。

更新

这段代码给了我结果，但我想要正则表达式而不是下面的代码。

package uri_keyword_extractor;

import org.apache.hadoop.hive.ql.exec.UDF;
import org.apache.hadoop.io.Text;

import java.util.ArrayList;

public class UDFUrlKeywordExtractor extends UDF {
    private  Text result = new Text();

    public  Text evaluate(Text url) {
        if (url == null) {
            return null;
        }
        String keywords = url_keyword_maker(url.toString());
        result.set(keywords);
        return result;
    }

    private static String url_keyword_maker(String url) {
        // TODO Auto-generated method stub
        ArrayList<String> keywordAr = new ArrayList<String>();
        char[] charAr = url.toCharArray();
        for (int i = 0; i < charAr.length; i++) {
            int current_index = i;
            // check if character is a-z or A-Z
            char ch = charAr[i];
            StringBuilder sb = new StringBuilder();
            while (current_index < charAr.length-1 && isChar(ch)) {
                sb.append(ch);
                current_index = current_index+1;
                ch = charAr[current_index];
            }
            String word = sb.toString();
            if (word.length() >= 2) {
                keywordAr.add(word);
            }
            i = current_index;
        }
        //
        StringBuilder sb = new StringBuilder();
        for(int i =0; i < keywordAr.size();i++) {
            String current = keywordAr.get(i);
            sb.append(current);
            if(i < keywordAr.size() -1) {
                sb.append(",");
            }
        }
        return sb.toString();
    }

    private static  boolean isChar(char ch) {
        // TODO Auto-generated method stub
        int ascii_value = (int) ch;
        // A-Z => (65,90) a-z => (97,122)
        // condition 1 : A-Z , condition 2 : a-z character check
        if (  (ascii_value >= 65 && ascii_value <= 90)  ||  (ascii_value >= 97 && ascii_value <= 122) ) {
            return true;
        } else {
            return false;
        }
    }

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        String test1 = "file:///storage/emulated/0/SHAREit/videos/Dangerous_Hero_(2017)____Latest_South_Indian_Full_Hindi_Dubbed_Movie___2017_.mp4";
        String test2 = "file:///storage/emulated/0/VidMate/download/%E0%A0_-_Promo_Songs_-_Khiladi_-_Khesari_Lal_-_Bho.mp4";
        String test3 = "file:///storage/emulated/0/bluetooth/%5DChitaChola%7B%7D%D8%B9%D8%A7%D9%85%D8%B1%24%20.3gp";
        System.out.println(url_keyword_maker(test1).toString());
        System.out.println(url_keyword_maker(test2).toString());
        System.out.println(url_keyword_maker(test3).toString());
    }
}