Regex not working on email domain selection properly

Question

var str = "[email protected]"; // true but coming false
var str1 = "[email protected]"; 
var str2 = "[email protected]";
var str3 = "[email protected]";
var patt = new RegExp("[a-z0-9._%+-]+@[a-z0-9.-]+?[\.com]?[\.org]?[\.co.uk]?[\.org.uk]$");
console.log( str + " is " + patt.test(str));
console.log( str1 + " is " + patt.test(str1));
console.log( str2 + " is " + patt.test(str2));
console.log( str3 + " is " + patt.test(str3));

Can anyone tell me what is the mistake, my .com example is not working properly

You need a grouping construct and a regex literal, var patt = /^[a-z0-9._%+-]+@[a-z0-9.-]+?(?:\.com|\.org|\.co\.uk|\.org\.uk)$/; — Wiktor Stribiżew
– Wiktor Stribiżew, Commented Aug 26, 2022 at 14:32

Wiktor Stribiżew · Accepted Answer · 2022-08-26 15:20:16Z

0

You need

A grouping construct instead of character classes
A regex literal notation so that you do not have to double escape special chars
The ^ anchor at the start of the pattern since you need both ^ and $ to make the pattern match the entire string.

So you need to use

var patt = /^[a-z0-9._%+-]+@[a-z0-9.-]+?(?:\.com|\.org|\.co\.uk|\.org\.uk)$/;

See the regex demo.

If you need to make it case insensitive, add i flag,

var patt = /^[a-z0-9._%+-]+@[a-z0-9.-]+?(?:\.com|\.org|\.co\.uk|\.org\.uk)$/i;

answered Aug 26, 2022 at 15:20

Wiktor Stribiżew

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