CODE EXAMPLE FOR JAVA

check if char is letter or digit

Character.isDigit(string.charAt(index)) //(JavaDoc) will return true if it's a digit
Character.isLetter(string.charAt(index)) //(JavaDoc) will return true if it's a letter
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How to check if a char is a letterJavascript By Ill Ibis on Dec 16 2021 ThankComment
function isCharacterALetter(char) {
  return (/[a-zA-Z]/).test(char)
}