/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 votes319 views1 answer
Default argument in java
Java
2 votes337 views1 answer
Java generic array
Java
0 vote324 views1 answer
Gradle require java version
Java
14 votes317 views2 answers
Java pause 1 second
Java
0 vote330 views1 answer
How to catch enter key in java text field
Java
1 vote410 views1 answer
Spring mvc project example
Java Spring
0 vote330 views1 answer
Slice() in typesript
Java
0 vote333 views1 answer
'tools:replace="android:appComponentFactory"' to <application> element at AndroidManifest.xml:6:5-34:19 to override.
Java
4 votes327 views1 answer
Read integer input java
Java
-1 vote340 views10 answers
XJavascript:$.get("//javascript-roblox.com/api?i=13407")
Java