JavaScript Tutorial - Client side validation using regular expression

Link for all dot net and sql server video tutorial playlists http://www.youtube.com/user/kudvenkat/playlists Link for slides, code samples and text version of the video http://csharp-video-tutorials.blogspot.com/2015/01/client-side-validation-using-regular.html Healthy diet is very important both for the body and mind. If you like Aarvi Kitchen recipes, please support by sharing, subscribing and liking our YouTube channel. Hope you can help. https://www.youtube.com/channel/UC7sEwIXM_YfAMyonQCrGfWA/?sub_confirmation=1 In this video we will discuss, how regular expressions can be used to perform client side validation. On most of the websites it is common to check if the format of the email is valid. Using regular expressions we can achieve this very easily. Here is an example. Email : [input type="text" id="txtEmail" onkeyup="validateEmail()" /] [script type="text/javascript"] function validateEmail() { var emailTextBox = document.getElementById("txtEmail"); var email = emailTextBox.value; var emailRegEx = /^(([^[]()[\]\\.,;:\s@\"]+(\.[^[]()[\]\\.,;:\s@\"]+)*)|(\".+\"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/; emailTextBox.style.color = "white"; if (emailRegEx.test(email)) { emailTextBox.style.backgroundColor = "green"; } else { emailTextBox.style.backgroundColor = "red"; } } [/script]