Regular Expression

[Ashish Bassi]

I need to create a regular expression to check if the password contains
- atleast 1 Capital letter
- atleast 1 Special character
- atleast 1 numeric

[Ulf Dittmer]

Welcome to JavaRanch.

On your way in you may have missed that we have a policy on screen names here at JavaRanch. Basically, it must consist of a first name, a space, and a last name, and not be obviously fictitious. Since yours does not conform with it, please take a moment to change it, which you can do right here.

[arulk pillai]

Try the following and test it thoroughly:

   
 
import java.util.regex.Matcher;
import java.util.regex.Pattern;
 
 
 
public class Test {
 
/**
 * @param args
 */
public static void main(String[] args) {

Pattern p = Pattern.compile("^(?=.*[A-Z])(?=.*[0-9])(?=.*\\p{Punct}).*$");
Matcher m = p.matcher("AAA999---");
boolean b = m.matches();

System.out.println(b);
}
 
}
 
 
 

look at http://java.sun.com/j2se/1.4.2/docs/api/java/util/regex/Pattern.html for explanation.
[ August 22, 2007: Message edited by: arulk pillai ]

[Alan Moore]

http://forum.java.sun.com/thread.jspa?threadID=5208327

[Ashish Bassi]

Thank, i tried it, it works in a stand alone java program, not in struts though, inspite of removing the "\" symbol

[prakash chandra]

Hi,
Following is the simple code which will fulfill your requirements. It depends on what special character you want in the Password. You can just append the special character you want in static variable SPECIAL of following code.

    
public class PasswordValidator {
    
    static String SPECIAL = "#$@&!";
        
    public static boolean validate(String str){
        boolean special = false;
        boolean caps = false;
        boolean numeric = false;
        int len = str.length();
        int lenSpecial = SPECIAL.length();
        str = str.trim();
        for(int i=0;i<len;i++){
        char temp = str.charAt(i);
        //Check for Special character
        for(int j=0;j < lenSpecial && special == false;j++){
        if(temp == SPECIAL.charAt(j)){
        special = true;
        break;
        }
        }
        int ascii = temp;
        //Check for number
        if((ascii >= 48 && ascii <= 57)&&(numeric == false)){
        numeric = true;
        }
        //Check for capital letters
        if((ascii >= 65 && ascii <= 90)&&(caps == false)){
        caps = true;
        }
        }
        return (caps && numeric && special);
    }
    
    public static void main(String[] arg){
    boolean result = PasswordValidator.validate("121123@511A3");
    System.out.println("Result: "+result);
    }
}

[ August 22, 2007: Message edited by: prakash chandra ]

[Bhaskar Reddy]

Have a look at RegEx Library.

For your specific req, you may have to search in that, or learn it and build it as per your requirement...