The script makes the following assumptions regarding what a valid email address is: -Contains a least one character procedding the "@" -Contains a "@" following the procedding character(s) -Contains at least one character following the "@", followed by a dot (.), followed by either a two character or three character string (a two character country code or the standard three character US code, such as com, edu etc) Note that this script requires NS 4 or IE 4 to function- all other browsers will simply not participate in the form validation process.Example: Directions: Simply cut and paste the below code into the section of your page.Having a-z and A-Z means that both lowercase and uppercase letters are allowed.indicates the minimum and maximum number of characters.If you want to use async validation you need to use a runtime that supports Promises.You can tell to use any A compatible promise implemention like this: There are already many validation libraries out there today but most of them are very tightly coupled to a language or framework.There are no required external dependencies at all!
If not, the form submition is canceled, and the surfer prompted to re-enter a valid address.The third parameter is a Match Evaluator delegate that represents the method that processes and replaces the matched text. The regular expression pattern is interpreted as follows. Regular Expressions Public Class Regex Utilities Dim invalid As Boolean = False public Function Is Valid Email(str In As String) As Boolean invalid = False If String. This will allow domain names with 2, 3 and 4 characters e.g.; us, tx, org, com, net, wxyz).On the final line we call test method for our regular expression and pass the email address as input.