1. matches() 匹配全部

Pattern p = Pattern.compile("reg");

Matcher m = p.matcher("String");

System.out.println(m.matches());

2:(matches 和find不要一起用,用reset()吐出来)

find()匹配部分

while(m.find()){

SYstem.out.println(m.group());//group() 每次循环 find()匹配到的部分

}

replaceAll() 替代匹配的所有

System.out.println(m.replaceAll("java"));

比replaceAll()更灵活的替换appendReplacement(StringBuffer sb,String yourString);

//把偶数index的java 替换为"猫叔";

StringBuffer sb = new StringBuffer();

int i=0;

while(m.find()){

i++;

if(i%2==0){

m.appendReplacement(sb, "猫叔");

}

}

m.appendTail(sb);

System.out.println(sb);

3.更强大的分组()()式

/*Pattern p2 = Pattern.compile("([\\w[-._.]]+)(@[\\w[\\d]]+\\.[\\w]+)");

Matcher m2 =p2.matcher("-newobj_1@163.com,newobj@163.com,1299291758@qq.com");

while(m2.find()){

System.out.println(m2.group(1));

}*/

4.实际应用(爬email)

...所有以上的内容如下:

package first;

import java.io.BufferedReader;

import java.io.File;

import java.io.FileReader;

import java.io.IOException;

import java.util.regex.Matcher;

import java.util.regex.Pattern;

public class T1 {

/**

* @param args

*/

public static void main(String[] args) {

//认识\s：space, \w: [a-zA-Z_0-9] , \d:[0-9]

//System.out.println(" \r\n\t".matches("\\s{4}"));

//System.out.println("hello sir".matches(".*sir$"));

//System.out.println("newobj@163.com".matches("[\\w[_.]]+@[\\w[_.]]+\\.[\\w[_.]]+"));

/*Pattern p = Pattern.compile("[\\d]{3,5}");

String tt = "123-2345-33333-00-12";

Matcher m = p.matcher(tt);

System.out.println(m.matches());

m.reset();

System.out.println(m.find());

System.out.println(m.find());

System.out.println(m.find());

System.out.println(m.find());*/

//看group(当前匹配的结果)以及repalceAll;

Pattern p = Pattern.compile("java",Pattern.CASE_INSENSITIVE);

String a = "I lova java ,he heats Java, hanmeimei love JAva too , and you about java ?";

Matcher m = p.matcher(a);

//while(m.find()){

//System.out.println(m.group());

//}

//System.out.println(m.replaceAll("java"));

//把偶数index的java 替换为"猫叔";

/*StringBuffer sb = new StringBuffer();

int i=0;

while(m.find()){

i++;

if(i%2==0){

m.appendReplacement(sb, "猫叔");

}

}

m.appendTail(sb);

System.out.println(sb);*/

//看看更强大的group

/*Pattern p2 = Pattern.compile("([\\w[-._.]]+)(@[\\w[\\d]]+\\.[\\w]+)");

Matcher m2 =p2.matcher("-newobj_1@163.com,newobj@163.com,1299291758@qq.com");

while(m2.find()){

System.out.println(m2.group(1));

}*/

//爬email

BufferedReader bfr = null;

try{

bfr = new BufferedReader(new FileReader(new File("D:/大家留下email吧.htm")));

String line ="";

String myemail = "newobj@163.com";

Pattern pemail = Pattern.compile("[\\w_-]+@[\\w\\d]+\\.[\\w]+");

Matcher meail = null;

//meail = pemail.matcher(myemail);

//System.out.println(meail.matches());

while((line=bfr.readLine())!=null){

meail = pemail.matcher(line);

while(meail.find()){

System.out.println(meail.group());

}

}

}catch (Exception e) {

e.printStackTrace();

}finally{

try {

bfr.close();

} catch (IOException e) {

e.printStackTrace();

}

}

}

}