Answers for "regex number or empty"

regex to check non empty string

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

regex is not empty string

const REGEXP = /^$/;

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

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

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