regex empty or null code example

Example 1: regex to check non empty string

/^(?!\s*$).+/

Example 2: regex empty string

const REGEXP = /^$/;

const validate = (text) => {     
    return REGEXP.test(text);
}

const isEmpty = validate("");
const isNotEmpty = validate("x");

console.log(isEmpty); //true
console.log(isNotEmpty); //false