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In case you are using Node.js, you can use the same regular expression function below to validate emails both on the clientside and the serverside.

Function for validating email address The above regular expression is a generic email validator, it may fail for some very rare but valid emails.

This was really a lengthy process which used to put a lot of burden on the server.

Java Script provides a way to validate form's data on the client's computer before sending it to the web server. First let us see how to do a basic form validation.

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You can perform email validation using Java Script to validate an email address in a form field.

The following code shows the implementation of this validate() function.

” Server-side checking entails the user submitting the form to the server, such as ASP, C# or PHP, then the server code checks and returns an error if it finds one. Client-side validation usually means: Java Script intercepting the form before it’s submitted to check for errors, possibly using regex.

This saves the trip to the server but still uses a bit of code.

An email address must contain at least a ‘@’ sign and a dot (.).

Also, the ‘@’ must not be the first character of the email address, and the last dot must at least be one character after the ‘@’ sign.

He has over 15 years of front-end web development experience and has worked with leading interactive companies in a number of fields, from medical software to automotive media.

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