字符串操作及正则表达式（regex）

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

public class RegexDemo {
    public static void main(String[] args) {
        //testMatches();
        //testReplace();
        //testGetSubstring();
        testSplit();
    }
    
    //测试匹配
    public static void testMatches() {
        String str = "asdasdasdsadasdasdasssssss";
        System.out.println(str.matches(".*ssssss.*"));
    }
    
    //测试替换
    public static void testReplace() {
        String str = "窗前明月光，asdasdad asdad";
        str = str.replaceAll("[\u4e00-\u9fa5]", "c");
        System.out.println(str);
    }
    
    //测试萃取
    public static void testGetSubstring() {
        String str = "100,2000, asd9090 898窗前明月光，asdasdad asdad";
        Pattern pattern = Pattern.compile("\\d+");
        Matcher matcher = pattern.matcher(str);
        while (matcher.find()) {
            System.out.println(matcher.group());
        }
    }
    
    //测试分割
    public static void testSplit() {
        String str = "100,2000, asd9090 898窗前明月光，asdasdad asdad";
        String[] strs = str.split("\\d+");
        for (int i = 0; i < strs.length; i++) {
            System.out.println(strs[i]);
        }
    }
}

public static void main(String[] args) {
  	System.out.println(parseStrToHexs("好雨知时节"));
  	System.out.println(parseBytesToStr(
    	"\\xe5\\xa5\\xbd\\xe9\\x9b\\xa8\\xe7\\x9f\\xa5\\xe6\\x97\\xb6\\xe8\\x8a\\x82"));
}
	
public static String parseStrToHexs(String str) {
    byte[] bs = str.getBytes();
    StringBuffer sb = new StringBuffer();
    for (byte b : bs) {
      	sb.append("\\x" + String.format(Locale.getDefault(), "%x", b));
    }
    return sb.toString();
}
public static String parseBytesToStr(String hexs) {
    String[] splits = hexs.split("[\\\\x\\\\X]");
    byte[] bs = new byte[splits.length];
    int i = 0;
    for (String s : splits) {
      	if (s==null || s.isEmpty()) {
     		continue;
      	}
      	bs[i] = ((byte)(0xff & Integer.parseInt(s, 16)));
      	i++;
    }
    return new String(bs);
}


//运行结果
//\xe5\xa5\xbd\xe9\x9b\xa8\xe7\x9f\xa5\xe6\x97\xb6\xe8\x8a\x82
//好雨知时节