/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

7 votes210 views3 answers
Incremento java
Java
1 vote287 views1 answer
Java joptionpane
Java
0 vote232 views1 answer
Log4j with spring boot restful services
Java
3 votes289 views3 answers
Java initialize map with values in one line
Java
1 vote235 views1 answer
Json array get json object
Java
0 vote254 views1 answer
URI/BEE problem no-1101 solution in Java
Java
0 vote208 views1 answer
Failed to introspect Class [springfox.documentation.swagger2.configuration.Swagger2DocumentationConfiguration] from ClassLoader
Java
0 vote264 views1 answer
H2-in-mem
Java
0 vote251 views1 answer
WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
Java
6 votes290 views1 answer
Is double and float the same function in java
Java