//reported to validate incorrectly: [email protected] as true /[A-Z0-9._% -] @[A-Z0-9-] ..[A-Z]/igm //reported to validate incorrectly: [email protected]@ as true /[A-Z0-9._% -] @[A-Z0-9.-] .[A-Z]/igm //current version /^(([^Sam Deering has 15 years of programming and website development experience.These tools are: Please note that while these tools make form validation much easier for the developer, they are not meant to replace client-side or server-side validation.Ideally, a developer will use all three methods to ensure user-entered data is correct. It will block spaces which are technically allowed by RFC, but they are so rare that I'm happy to do this. Combined with feature detection and the bare-bones validation from Squirtle's Answer, it frees you from the regular expression massacre and does not bork on old browsers. Even if you could perfectly determine whether an email is RFC-syntactically valid, that wouldn't tell you whether it belongs to the person who supplied it. Here's the Java Script function I use to check if a string looks like a valid mail address: Why? With this in mind, you can simply check whether a string looks like a valid email address on the client and perform the strict check on the server. He was a website consultant at Console, ABC News, Flight Centre, Sapient Nitro, and the QLD Government and runs a tech blog with over 1 million views per month.Currently, Sam is the Founder of Crypto News, Australia.
HTML5 has introduced a couple of tools which help to ensure that user-entered data is valid before even using any Java Script function.
Form validation is the practice of ensuring that data entered by a user through a form is correct.
A very basic example is when a user has been prompted to enter an email address, form validation is used to ensure that this is in the format of ''[email protected]''.
In this lesson, the concept of form validation is explored, as well as how to use HTML and Java Script to validate forms on the client-side.
You will learn some useful terms and get see some examples as well!
But keep in mind that one should not rely only upon Java Script validation. This should be validated on the server side as well.