Answers for "js match exact string but insensitve to upper and lower case"

find capital word in string javascript

const str = "HERE'S AN UPPERCASE PART of the string";
const upperCaseWords = str.match(/(\b[A-Z][A-Z]+|\b[A-Z]\b)/g);

console.log(upperCaseWords);

how to find if given character in a string is uppercase or lowercase in javascript

var str = S;

  if (str == str.toUpperCase())
  {
    console.log(" Uppercase");
  }
  else
  {
    console.log("Lowercase");
  }