Regex to check if the email format is valid or not (#683)

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Added a comment about the code only working in ES2021

---------

Co-authored-by: Laszlo <47461634+Lacah@users.noreply.github.com>

Author: DhanushNehru

Regular Expressions/Email Address Validation/isEmail.js

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+const emailRegex = /^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$/;
+
+const email = "example@email.com";
+
+if (emailRegex.test(email)) {
+  console.log("Valid email address");
+} else {
+  console.log("Invalid email address");
+}

Regular Expressions/Email Address Validation/readme.md

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+## Email Address Validation
+
+This regular expression checks if the provided string matches the common pattern for email addresses.
+
+**Please note that the code is based on ES2021, and as such, will not work in the global scope or scopes that are not ES2021 compatible.**
+
+^[a-zA-Z0-9._%+-]+: Matches one or more characters that can be letters (both uppercase and lowercase), digits, dots, underscores, percent signs, or plus or hyphen signs at the start of the string.
+@: Matches the "@" symbol.
+[a-zA-Z0-9.-]+: Matches one or more characters that can be letters, digits, dots, or hyphens in the domain part of the email address.
+\.: Matches a dot.
+[a-zA-Z]{2,}$: Matches two or more letters at the end of the string, representing the top-level domain (TLD) of the email address.