check if a string is alphanumeric
if (string.match(/^[0-9A-Za-z]+$/) === null) {
//is not alphanumeric
}else{
//it is alphanumeric
}check if a string is alphanumeric
if (string.match(/^[0-9A-Za-z]+$/) === 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');
}
}Copyright © 2021 Codeinu
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