Regex, aby sprawdzić nie pusty ciąg
/^(?!\s*$).+/
Delta Sierra
/^(?!\s*$).+//^$/ // match exactly ""const REGEXP = /^$/;
const validate = (text) => {
return REGEXP.test(text);
}
const isEmpty = validate("");
const isNotEmpty = validate("x");
console.log(isEmpty); //true
console.log(isNotEmpty); //false