java regex

1import java.util.regex.*;  
2public class RegexExample1{  
3public static void main(String args[]){  
4//1st way  
5Pattern p = Pattern.compile(".s");//. represents single character  
6Matcher m = p.matcher("as");  
7boolean b = m.matches();  
8  
9//2nd way  
10boolean b2=Pattern.compile(".s").matcher("as").matches();  
11  
12//3rd way  
13boolean b3 = Pattern.matches(".s", "as");  
14  
15System.out.println(b+" "+b2+" "+b3);  
16}}  

1//Ther are three type of REGULAR EXPRESSION     
2   //first
3   ^(.+)@(.+)$   "^(.+)@(.+)$\""
4   //second
5   ^[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,6}$
6     //third
7   ^[\\w!#$%&'*+/=?`{|}~^-]+(?:\\.[\\w!#$%&'*+/=?`{|}~^-]+)*@(?!-)(?:[a-zA-Z0-9-]+\\.)+[a-zA-Z]{2,6}$  

1import java.io.*;
2import java.util.regex.*;
3
4public class testRegex {
5
6    private static Pattern pattern;
7    private static Matcher matcher;
8
9    public static void main(String args[]) {
10        pattern = Pattern.compile("Hugo");
11        matcher = pattern.matcher("Hugo Etiévant");
12        while(matcher.find()) {
13            System.out.println("Trouvé !");
14        }
15    }
16}

1x.replaceAll("\\s+", "");
2