/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 vote125 views3 answers
Cant change button color when app run android studio
Java
1 vote190 views1 answer
Java intercept ctrl c
Java
0 vote141 views1 answer
Button loginButton = new Button(this); loginButton.setText("Login"); Button register Button = new Button(this); register Button .gettext("Register");
Java
0 vote151 views1 answer
How to add a singleton hashset in java
Java
0 vote141 views1 answer
Jlabel icon
Java
0 vote131 views1 answer
Racine carré java
Java
0 vote140 views1 answer
Javax big int validation in spring boot
Java
0 vote140 views1 answer
Java -jar -l resources\es.porperties -i ejemplo.txt -o inject.bin
Java
0 vote126 views1 answer
Antlr missing argument for lexer command 'channel'
Java
0 vote136 views1 answer
The Google Mobile Ads SDK was initialized incorrectly. AdMob publishers
Java