/Java/Java code to check if string is alphanumeric

Java code to check if string is alphanumeric

java.util.regex.*;
class AlphanumericExample
{
  public static void main(String...s)
  {
    String s1="adA12", s2="jh@l";
    System.out.println(s1.matches("[a-zA-Z0-9]+"));
    System.out.println(s2.matches("[a-zA-Z0-9]+"));
  }
}

Check if a string is alphanumeric

 if (string.match(/^[0-9A-Za-z]+$/) === null) { 
 //is not alphanumeric
 }else{
 //it is alphanumeric
 }

Check character is alphanumeric java

 javaCopypublic class CheckCharAlpha {
    public static void main(String[] args) {

        boolean letterOrDigit = isAlphaNumeric('k');
        System.out.println(letterOrDigit);
    }

    public static boolean isAlphaNumeric(char char1) {
        return (char1 >= 'a' && char1 <= 'z') || (char1 >= 'A' && char1 <= 'Z') || (char1 >= '0' && char1 <= '9');
    }
}

Source: delftstack.com

Similar codes

0 vote171 views1 answer
Seekbar thumb position
Java
0 vote156 views1 answer
How to use advanced math in java
Java
0 vote179 views1 answer
Android studio get id name from view
Java
0 vote184 views1 answer
Find the unique element in a list java
Java
-1 vote193 views2 answers
Java program to print vowels in a string
Java
0 vote165 views3 answers
Char to charsequence in java
Java
2 votes167 views1 answer
Javafx get screen size
Java
8 votes184 views1 answer
Import math java
Java
3 votes181 views1 answer
Change font size java swing
Java
4 votes216 views4 answers
Java arraylist declaration
Java