黑马程序员——正则表达式总结

 1 练习（匹配）
 2 /*
 3  * 通过正则表达式，实现手机号只能是13xxx 15xxx 18xxx.
 4  */
 5 package bolgtest;
 6 import java.io.*;
 7 public class RegexTest1 {
 8  
 9  public static void main(String[] args)throws Exception {
10   BufferedReader buffer  = new BufferedReader(new InputStreamReader(System.in));
11   String a  = buffer.readLine();
12   String regex = "[1][358]\\d{9}";
13   System.out.println(a.matches(regex));
14   buffer.close();
15  
16  
17  }
18 
19 }

 1 练习(替换）
 2 /*
 3  * 把字符串“ddaghdfjjiifhdhddoooo”中的叠词替换成单个符号
 4  */
 5 package bolgtest;
 6 
 7 public class RegexTest2 {
 8 
 9  public static void main(String[] args) {
10   String str = new String("ddaghdfjjiifhdhddoooo");
11   String regex = "(.)\\1*";
12   String strcopy = str.replaceAll(regex, "$1");
13   System.out.println(strcopy);
14 
15  }
16 
17 }

 1 练习（切割）
 2 /*
 3  * 已知字符串"ddaghdfjjiifhdhddoooo"，按叠词切割该字符串
 4  */
 5 
 6 package bolgtest;
 7 
 8 public class RegexTest3 {
 9 
10  public static void main(String[] args) {
11   String str = new String("ddaghdfjjiifhdhddoooo");
12   String regex = "(.)\\1+";
13   String[] strArray = new String[10];
14   strArray = str.split(regex);
15   for(String s : strArray){
16    System.out.println(s);
17   }
18  
19 
20  }
21 
22 }

 1 练习
 2 /*
 3  * 字符串"ming tian jiu yao fang jia le "通过正则表达式获取三个字母构成的单词
 4  */
 5 
 6 package bolgtest;
 7 
 8 import java.util.regex.Matcher;
 9 import java.util.regex.Pattern;
10 
11 public class RegexTest4 {
12 
13  public static void main(String[] args) {
14   String str = "ming tian jiu yao fang jia le";
15   String regex = "\\b[a-z]{3}\\b";
16   Pattern pattern  = Pattern.compile(regex);
17   Matcher mather = pattern.matcher(str);
18   while(mather.find()){
19    System.out.println(mather.group());
20   }
21 
22  }
23 
24 }