/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

1 vote264 views3 answers
How to sort arraylist in java
Java
0 vote270 views1 answer
Are inner classes inherited
Java
0 vote272 views1 answer
Keytool error: java.io.FileNotFoundException: c:\Users\USER_NAME\upload-keystore.jks (The system cannot find the path specified)
Java
0 vote276 views1 answer
Java iterator to stream
Java
0 vote262 views1 answer
Groovy BASE64 Encode
Java
0 vote290 views1 answer
How to switch between two stylesheets in javafx.
Java
1 vote260 views3 answers
Debug keystore
Java
0 vote253 views1 answer
Java files createdirectories if they don't exist
Java
2 votes276 views1 answer
Intellij run java file
Java
0 vote259 views1 answer
Spring.jpa.properties.hibernate.dialect values
Java