Check mail id is valid or not

To check if an email address is valid or not, you can use a regular expression (regex) to validate the format of the email address. Here's an example of a regex pattern that can be used to validate an email address:

^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$

This pattern matches most common email address formats, including:

Local part (before the @ symbol): one or more characters (letters, numbers, dot, hyphen, underscore, plus sign, or percent sign)
Domain (after the @ symbol): one or more characters (letters, numbers, dot, or hyphen)
Top-level domain (after the last dot): two or more characters (letters only)

Here's a breakdown of the pattern:

^ matches the start of the string
[a-zA-Z0-9._%+-]+ matches one or more characters that are letters (both uppercase and lowercase), numbers, dot, hyphen, underscore, plus sign, or percent sign
@ matches the @ symbol
[a-zA-Z0-9.-]+ matches one or more characters that are letters, numbers, dot, or hyphen
\. matches a dot (escaped with a backslash because dot has special meaning in regex)
[a-zA-Z]{2,} matches two or more characters that are letters only (this is the top-level domain)
$ matches the end of the string

You can use this pattern in a programming language or a text editor to validate an email address. For example, in JavaScript, you can use the test() method to validate an email address:

const emailRegex = /^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$/;
const email = "[email protected]";
if (emailRegex.test(email)) {
  console.log("Email is valid");
} else {
  console.log("Email is not valid");
}

Keep in mind that this pattern does not validate whether the email address actually exists or is in use. It only checks the format of the email address.

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Check mail id is valid or not