import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class JavaBasic {
     public static void main(String[] args){
      StringBuffer sd = new StringBuffer();
      String hhhString="adlkll";
      Pattern pattern = Pattern.compile("[A-Za-z]*");
      Matcher matcher = pattern.matcher(hhhString);
      if (matcher.matches()){
       System.out.println("符合要求");
      } else {
       System.out.println("不符合要求");    //是否符合正则表达式内容
      }
     
//      hhhString=hhhString.replace(" ", ",");
      String[] ss1=hhhString.trim().split(" ");
      System.out.println(ss1.length);
      for(int i=0;i<ss1.length;i++){
       sd.append(ss1[i]);                           //字符串连接,如果选lengsh-i,可以确定选第几个字符串
       
      }
      System.out.println(sd.toString());
     
     
     StringBuffer sb = new StringBuffer();
   String s = "  ab ce as";
      String[] ss =s.trim().split(" ");
      System.out.println(ss.length);
      for(int i=0;i<ss.length;i++){
       sb.append(ss[i]);                            //显示全部自字符
      }
      System.out.println(sb.toString());

     }
}