package com.wepull.regex;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Demo1 {
/**
* 判断一个字符串是否由纯数字组成
*/
private void fun1() {
String str = "0123456789";
System.out.println(str.matches("\\d+"));
}
private void testString() {
// System.out.println("b".matches("."));//true
// System.out.println("aa".matches("aa")) ;
// System.out.println("aaaa".matches("a*")) ; //true
// System.out.println("aaaa".matches("a+")) ;//true
// System.out.println("".matches("a*"));//true
// System.out.println("aaaa".matches("a?"));//false
// System.out.println("".matches("a?"));///true
// System.out.println("a".matches("a?"));
// System.out.println("3366572".matches("\\d{3,10}"));//true
System.out.println("192.168.0.220"
.matches("\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}"));
//
// System.out.println("192".matches("[0-2][0-9][0-9]"));
}
/**
* 范围
*/
private static void fun5() {
// System.out.println( "e".matches("[abc]"));
// System.out.println( "e".matches("[^abc]"));
// System.out.println( "A".matches("[a-zA-Z]"));
// System.out.println( "A".matches("[a-z]|[A-Z]"));
// System.out.println( "A".matches("[a-z[A-Z]]"));
// System.out.println( "B".matches("[A-Z&&[ABC]]"));
}
private void testEmail() {
String email = "[email protected]";
String regex = "\\w+@\\w+\\.(com|cn|gov|net)";
System.out.println(email.matches(regex));
}
private void testEmail2() {
String email = "[email protected]";
String regex = "(\\w+)@(\\w+)\\.(com|cn|gov|net)";
Pattern p = Pattern.compile(regex);
Matcher m = p.matcher(email);
if (m.matches()) {
System.out.println("第0组" + m.group(0));
System.out.println("第1组" + m.group(1));
System.out.println(m.start(1) + " " + m.end(1));
System.out.println("第2组" + m.group(2));
System.out.println(m.start(2) + " " + m.end(2));
System.out.println("第3组" + m.group(3));
}
}
private void testFind() {
String s = "下面是公司电话号码086-027-87591191-" + "你能使用正则表达式分别找出区号和电话吗？";
String regex = "\\d{3,8}";
Pattern p = Pattern.compile(regex);
Matcher m = p.matcher(s);
while (m.find()) {
System.out.println(m.group());
}
}
public static void main(String[] args) {
// new Demo1().fun1();
Demo1 d = new Demo1();
// d.fun5();
// d.testEmail();
// d.testEmail2();
d.testFind();
}
}
package com.wepull.regex;
import java.util.regex.Pattern;
public class TestPattern {
/**
* String str =“hello444java3377Lady GaGa”，
* 按照数字把字符串拆分 （hello,java,lady GaGa）
*/
private void testSplit() {
String str ="hello444java3377Lady GaGa";
Pattern p = Pattern.compile("\\d+");//通过compile方法 编译得到一个指定规范的正则表达式 模板对象 pattern
String[] strs = p.split(str);//把字符串按照指定的模式拆分
for (String s : strs) {
System.out.println(s);
}
}
/**
* @param args
*/
public static void main(String[] args) {
TestPattern t = new TestPattern();
t.testSplit();
}
}
package com.wepull.regex;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class TestMatcher {
/**
* String str =“222hello444java3377Lady GaGa”，
把字符字母都替换成 -”
*/
public void test(){
String str = "222hello444java3377Lady GaGa";
String regex = "[a-zA-Z]+";
Pattern p = Pattern.compile(regex);
Matcher m = p.matcher(str);//通过Pattern对象创建一个匹配器
String s = m.replaceAll("-");
System.out.println(s);
}
public static void main(String[] args) {
TestMatcher t = new TestMatcher();
t.test();
}
}
