ashwinkumar2438

var regex=/(?<circle>\d{2})(?<district>\d)[\s-]?(?<office>\d{3})/;
console.log(regex.exec("412207").groups); //{circle: "41", district: "2", office: "207"}
console.log(regex.exec("182-101").groups); //{circle: "18", district: "2", office: "101"}
console.log(regex.exec("224 123").groups);  //{circle: "22", district: "4", office: "123"}

ashwinkumar2438

var str="\n9 " /* " 
                   9 " */
var regex=new RegExp("\n\\d\\s"); // /\n\d\s/

regex.test(str); //true;

ashwinkumar2438

var str="\n9 " /* " 
                   9 " */
var regex=/\n\d\s/;

regex.test(str); //true;

ashwinkumar2438

let x="abc";
let re1=new RegExp(x); // output: /abc/
let re2=/x/; // output: /x/ won't work as a variable in literal notation.

re1.test("abcdefg"); //true
re2.test("abcdefg"); //false

ashwinkumar2438

let re1=new RegExp("abc"); //output: /abc/
let re2=/abc/;  //output: /abc/
re1.test("abcdefg") //true;
re2.test("abcdefg") //true;

ashwinkumar2438

var name=" R e g E x p ";
var namewithoutspaces1=name.replace(" ","");  // "R e g E x p "
var namewithoutspaces2=name.replace(/\s/g,"");// "RegExp"

ashwinkumar2438

var name=" R e g E x p"
let namewithoutspaces=name.split(" ").join(""); 
console.log(namewithoutspaces); // "RegExp"