Example: Using Regex
// program to validate an email address
function validateEmail(email_id) {
const regex_pattern = /^(([^<>()[\]\\.,;:\s@\"]+(\.[^<>()[\]\\.,;:\s@\"]+)*)|(\".+\"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;
if (regex_pattern.test(email_id)) {
console.log('The email address is valid');
}
else {
console.log('The email address is not valid');
}
}
validateEmail('[email protected]');
validateEmail('hello@com');
Output
The email address is valid The email address is not valid
In the above program, the regular expression pattern
/^(([^<>()[\]\\.,;:\s@\"]+(\.[^<>()[\]\\.,;:\s@\"]+)*)|(\".+\"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/
checks if an email address is valid or not.
The test() method returns true if there is a match in the string with the regex pattern.
The regular expression (regex) describes a sequence of characters used for defining a search pattern.