javascript new regexp code example

Example 1: javascript new Regexp with flag

new RegExp(/ab+c/, 'i') // literal notation
new RegExp('ab+c', 'i') // constructor

const pattern='some pattern';
new RegExp(pattern)

Example 2: using regex in javascript

//Adding '/' around regex
var regex = /\s/g;
//or using RegExp
var regex = new RegExp("\s", "g");

Example 3: js regrex

var s = "Please yes\nmake my day!";
s.match(/yes.*day/);
// Returns null
s.match(/yes[^]*day/);
// Returns 'yes\nmake my day'