JS to verify whether the string is a regular expression

js Verify that the string is a regular expression , Correct return true, Otherwise return to false.

const isRegExp = (v) => {
    
  return Object.prototype.toString.call(v) === '[object RegExp]';
}
//  Example 
const reg = /[0-9a-z]/;
console.log(' Regular or not reg：', isRegExp(reg)); //  Output  true
console.log(' Regular or not reg：', isRegExp(/[0-9a-zA-Z]+/g)); //  Output  true
console.log(' Regular or not reg：', isRegExp('[0-9a-zA-Z]+')); //  Output  false,  Must be a complete regular band  //  Of 
console.log(' Regular or not reg：', isRegExp('')); //  Output  false
console.log(' Regular or not reg：', isRegExp(1111)); //  Output  false