/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

2 votes162 views3 answers
Java check ipv6 with regex
Java
0 vote126 views1 answer
Java android edit text set value
Java
1 vote152 views1 answer
Java get color from rgb values
Java
0 vote149 views1 answer
How to secure specific url in spring security
Java Spring
0 vote155 views1 answer
Spring cloud config server authentication
Java Spring
0 vote142 views1 answer
Webmvctest vs springboottest
Java
1 vote145 views2 answers
How to clear text fields in java
Java
1 vote119 views1 answer
Functional remove java
Java
3 votes123 views1 answer
Jlabel text center
Java
0 vote160 views1 answer
Java assert
Java