So we should use a new regular expression to forbid underscopes. Next, we want to permit only passwords that contain letters and at least one numeral.
For that we use the seacrh() method and two more regular expressions: /(a-z) / and /(0-9)/.
If its not blank, we check the length of the string and permit only usernames that are between 5 and 15 characters.
At first we check if the user entered anything at all in the email field.This j Query plugin makes simple clientside form validation easy, whilst still offering plenty of customization options.It makes a good choice if you’re building something new from scratch, but also when you’re trying to integrate something into an existing application with lots of existing markup.Any interactive web site has form input - a place where the users input different kind of information.This data is passed to ASP script, or some other technology and if the data contains an error, there will be a delay before the information travels over the Internet to the server, is examined on the server, and then returns to the user along with an error message.