const regex = /^(?=^[\w.@!#$%&'*+/=?^`{|}~-]{7,254}$)(?<username>(?=^[\w.!#$%&'*+/=?^`{|}~-]{1,64}@)[\w!#$%&'*+/=?^`{|}~-]+(?:\.[\w!#$%&'*+/=?^`{|}~-]+)*)@(?<domain>(?=\b[a-z\d.-]{5,252}$)(?:[a-z\d](?:[a-z\d-]{0,61}[a-z\d])\.)+(?:(?:[a-z](?:[a-z-]{0,61}[a-z]))|(?:(?=[a-z\d-]*?[a-z])(?=[a-z\d-]*?[\d])[a-z\d](?:[a-z\d-]{0,61}[a-z\d]))))$/gi;
// Alternative syntax using RegExp constructor
// const regex = new RegExp('^(?=^[\\w.@!#$%&\'*+\/=?^`{|}~-]{7,254}$)(?<username>(?=^[\\w.!#$%&\'*+\/=?^`{|}~-]{1,64}@)[\\w!#$%&\'*+\/=?^`{|}~-]+(?:\\.[\\w!#$%&\'*+\/=?^`{|}~-]+)*)@(?<domain>(?=\\b[a-z\\d.-]{5,252}$)(?:[a-z\\d](?:[a-z\\d-]{0,61}[a-z\\d])\\.)+(?:(?:[a-z](?:[a-z-]{0,61}[a-z]))|(?:(?=[a-z\\d-]*?[a-z])(?=[a-z\\d-]*?[\\d])[a-z\\d](?:[a-z\\d-]{0,61}[a-z\\d]))))$', 'gi')
const str = `Add the multiline (/m) Regex option for testing or go to te Unit Tests section...
Valid addresses:
test@email.com
Test2@email.com
another.test@email.com
testwith+flag@email.com
withanyofthese#!%\$'&+*-/=?^_.{|}~symbols@email.com
upto64charactersusername56789c123456789d123456789e123456789f1234@email.com
test@with.any.number.of.labels.separated.by.dots.email.com
test@even.with.digits.1234567890.email.com
test@and-hypens-email.com
t@upto252charactersdomainname89c123456789d123456789e123456789f123.butonlyupto63charactersperlabel6789j123456789k123456789l1234567.9m123456789n123456789o123456789p123456789q123456789r123456789s1.3456789t123456789u123456789v123456789w123456789x12.email.com
Invalid adresses:
.usernamestartingwithdot@email.com
usernameendingwithdot.@email.com
havingtwo..consecutivedotsintheusername@email.com
test@orinthedomainname..email.com
test@having.all.numerical.top-level-domain.888
havinglessthan2characterperlabel@1.a.email.com
(havingothersymbolsnotlisted)@email.com
usingotherthanletters.digits.and-hyphens{anddots}inthedomainname@[123.45.67.89]
`;
// Reset `lastIndex` if this regex is defined globally
// regex.lastIndex = 0;
let m;
while ((m = regex.exec(str)) !== null) {
// This is necessary to avoid infinite loops with zero-width matches
if (m.index === regex.lastIndex) {
regex.lastIndex++;
}
// The result can be accessed through the `m`-variable.
m.forEach((match, groupIndex) => {
console.log(`Found match, group ${groupIndex}: ${match}`);
});
}
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for JavaScript, please visit: https://developer.mozilla.org/en/docs/Web/JavaScript/Guide/Regular_Expressions