Validating Email Address Top-Level Domains in JavaScript As always, the first part of the regular expression can be changed to match cases with uppercase letters, including special characters such as + or _, etc. With this approach, you can change any literal string to match it according to your needs. To validate an email address pertaining to a specific domain thus becomes an easy task, utilizing the RegExp class: let regex = new RegExp( ' ') These two are the typical problem-causing variables, as domain names can vary wildly. The rough sketch would look like this: makes our task a lot easier, as some of the variables such as the domain name and organization type are now fixed. All the staff have an email ending with and the user string is the one changing. Say, you work in a company called Stack Abuse. Validating an Email Address Domain with JavaScript Let's take a look at some general cases referring to the domain and top-level domain. This makes specific email address validation more accurate using the same general formats as we've just seen - you don't have to cover as many edge cases. The less uncertainty there is, the less restrictions you need to impose using an expression. Lowering the amount of uncertainty helps. Technically speaking, could exist, so who are we to say it doesn't based on just a Regular Expression? Specific Email Addresses Though, even the most robust, complex email address validation expressions fail on this - they're there to validate the form, not whether the email exists. In conclusion, this is a rough sketch: characters) Additionally, the second string needs to contain a dot, which has an additional 2-3 characters after that. What does an email address entail? It has to have a symbol, as well as some string preceding it, and some string proceeding it. Whether this is a good thing or not is debatable.
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