match(regexp) Executes a search for a match within a string based on a regular expression. It returns an array of information or null if no match is found.

gistfile1.txt

//match(regexp) //select integers only
var intRegex = /[0-9 -()+]+$/;  

 

var myNumber = '999';
var myInt = myNumber.match(intRegex);
console.log(isInt);
//output: 999

 

var myString = '999 JS Coders';
var myInt = myString.match(intRegex);
console.log(isInt);
//output: null