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Regular expression for a hexadecimal number greater than 10 and should be even in length in java.
Following is the regular expression to match hexadecimal number greater than 10 with even length −
^(?=.{10,255}$)(?:0x)?\p{XDigit}{2}(?:\p{XDigit}{2})*$Where,
^ − Matches the starting of the sentence.
(?=.{10,255}$) − String ending with characters with 10 to 255.
\p{XDigit}{2} − Two hexa-decimal characters.
(?:\p{XDigit}{2})* − 0 or more sequences of double hexa-decimal characters.
$ − Matches the end of the sentence.
Example 1
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class JavaExample51 {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
String nums[] = new String[5];
for(int i=0; i<nums.length; i++){
System.out.println("Enter a hexa-decimal number: ");
nums[i] = sc.nextLine();
}
//Regular expression to accept English alphabet
String regex = "^(?=.{10,255}$)(?:0x)?\p{XDigit}{2}(?:\p{XDigit}{2})*$";
//Creating a pattern object
Pattern pattern = Pattern.compile(regex);
for (String hex : nums) {
//Creating a Matcher object
Matcher matcher = pattern.matcher(hex);
if(matcher.find()) {
System.out.println(hex+" is valid");
}else {
System.out.println(hex+" is not valid");
}
}
}
}Output
Enter a hexa-decimal number: 0x1234567890 Enter a hexa-decimal number: 123456789 Enter a hexa-decimal number: 123456789012 Enter a hexa-decimal number: sfdgdf35364 Enter a hexa-decimal number: $@%#BV#* 0x1234567890 is valid 123456789 is not valid 123456789012 is valid sfdgdf35364 is not valid $@%#BV#* is not valid
Example 2
import java.util.Scanner;
public class JavaExample {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.println("Enter a hexa-decimal number: ");
String name = sc.nextLine();
String regex = "^(?=.{10,255}$)(?:0x)?\p{XDigit}{2}(?:\p{XDigit}{2})*$";
boolean result = name.matches(regex);
if(result) {
System.out.println("Given number is valid");
}else {
System.out.println("Given number is not valid");
}
}
}Output 1
Enter your name: 0x1234567890 Given name is valid
Output 2
Enter a hexa-decimal number: 024587545 Given number is not valid
Updated on: 13-Jul-2020
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