Check that all symbols are unique in the string

checkUniqueSymbols.js

function checkUniqueSymbols(inputStr) {
	if (inputStr) {
		const hasDuplicateSymbols = inputStr.match(/(\w)(.+)?\1/) !== null;
		return !hasDuplicateSymbols;
	}
	return false;
}
console.info("abcadez", checkUniqueSymbols("abcadez")); // false
console.info("abcdefg", checkUniqueSymbols("abcdefg")); // true
console.info(" try ", checkUniqueSymbols(" try ")); // true
console.info(" ", checkUniqueSymbols(" ")); // true