一个可以链式使用正则的类

import java.util.regex.*;


 * Created by wht on 2017/3/18.
 */
public class  {

    private  String string = "";

    public () {
    }

    public (String string) {
        this.string = string;
    }

    public RexString getRex(String rex) {
        Pattern p = Pattern.compile(rex);
        Matcher m = p.matcher(string);
        if (m.find()) {
            return new RexString(m.group());
        }
        return new RexString();
    }

    
    public String toString() {
        return this.string;
    }
}

RexString rexString = new RexString("xxx");
RexString rs = rexString.getRex(rex1).getRex(rex2).getRex(rex3) ···
String result = rs.toString();