/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 vote161 views1 answer
How to see if a shape is touching another shape in java
Java
-1 vote171 views1 answer
Java localdate subtract two dates
Java
3 votes172 views1 answer
Keytool command sha256
Java
0 vote173 views1 answer
Java within class and within package
Java
1 vote180 views1 answer
Change color of eclipse editor
Java
1 vote182 views1 answer
Jstl for
Java
0 vote165 views1 answer
Resource leak: 'scanner' is never closed
Java
1 vote162 views1 answer
Java product 1 to n
Java
16 votes167 views2 answers
Bufferedreader java
Java
28 votes183 views6 answers
How to get current date in java
Java