VBScript to Validate Email AddressI want to share my VBScript I use constantly on my site. Here it is :
<%
' Function IsEmailValid(strEmail)
' Action: checks if an email is correct.
' Parameter: strEmail - the Email address
' Returned value: on success it returns True, else False.
Function IsEmailValid(strEmail)
Dim strArray
Dim strItem
Dim i
Dim c
Dim blnIsItValid
' assume the email address is correct
blnIsItValid = True
' split the email address in two parts: name@domain.ext
strArray = Split(strEmail, "@")
' if there are more or less than two parts
If UBound(strArray) <> 1 Then
blnIsItValid = False
IsEmailValid = blnIsItValid
Exit Function
End If
' check each part
For Each strItem In strArray
' no part can be void
If Len(strItem) <= 0 Then
blnIsItValid = False
IsEmailValid = blnIsItValid
Exit Function
End If
' check each character of the part
' only following "abcdefghijklmnopqrstuvwxyz_-."
' characters and the ten digits are allowed
For i = 1 To Len(strItem)
c = LCase(Mid(strItem, i, 1))
' if there is an illegal character in the part
If InStr("abcdefghijklmnopqrstuvwxyz_-.", c) <= 0 And Not IsNumeric(c) Then
blnIsItValid = False
IsEmailValid = blnIsItValid
Exit Function
End If
Next
' the first and the last character in the part cannot be . (dot)
If Left(strItem, 1) = "." Or Right(strItem, 1) = "." Then
blnIsItValid = False
IsEmailValid = blnIsItValid
Exit Function
End If
Next
' the second part (domain.ext) must contain a . (dot)
If InStr(strArray(1), ".") <= 0 Then
blnIsItValid = False
IsEmailValid = blnIsItValid
Exit Function
End If
' check the length oh the extension
i = Len(strArray(1)) - InStrRev(strArray(1), ".")
' the length of the extension can be only 2, 3, or 4
' to cover the new "info" extension
If i <> 2 And i <> 3 And i <> 4 Then
blnIsItValid = False
IsEmailValid = blnIsItValid
Exit Function
End If ' after . (dot) cannot follow a . (dot)
If InStr(strEmail, "..") > 0 Then
blnIsItValid = False
IsEmailValid = blnIsItValid
Exit Function
End If
' finally it's OK
IsEmailValid = blnIsItValid
End Function
%> Enjoy,<br>
Csaba
<br>
Enjoy,
Csaba
|
| DISCLAIMER: The content provided in this article is not warranted or guaranteed by Developer Shed, Inc. The content provided is intended for entertainment and/or educational purposes in order to introduce to the reader key ideas, concepts, and/or product reviews. As such it is incumbent upon the reader to employ real-world tactics for security and implementation of best practices. We are not liable for any negative consequences that may result from implementing any information covered in our articles or tutorials. If this is a hardware review, it is not recommended to open and/or modify your hardware. |
More ASP Code Articles
More By aspfree  developerWorks - FREE Tools!
|
The IBM DB2 Deep Compression ROI tool is designed for DBA’s and IT management personnel to perform a clinical analysis of the cost savings gained from the Storage Optimization feature of DB2 9 for Linux, UNIX and Windows. The feature, also known as Deep Compression, compresses data that lies within a database by up to 80% at times.
FREE! Go There Now!
| | | |
David Barnes, Lead Evangelist for IBM Emerging Internet Technologies will discuss aspects of Web 2.0 that bring value to corporations, academia, and government. He'll also discuss IBM's vision around Web 2.0, including the importance of remixability and consumability. The discussion will culminate with examples of various IBM Software Group solutions you can use to get ahead of the Web 2.0 adoption curve.
FREE! Go There Now!
| | | |
Build secure Web services with transport-level security using IBM Rational Application Developer V7 and IBM WebSphere Application Server V6.1. Follow this three-part series for step-by-step instructions about how to develop Web services and clients, configure HTTP basic authentication, and configure HTTP over SSL (HTTPS). This first part of the series walks you through building a Web service for a simple calculator application. You generate and test two different types of Web services clients: a Java Platform, Enterprise Edition (Java EE) client and a stand-alone Java client. You also handle user-defined exceptions in Web services.
FREE! Go There Now!
| | | |
Join us for this on demand webcast to learn about developing complex systems more quickly and efficiently. We'll cover market drivers for developing, governing and reusing systems software assets and how you can develop system software assets with Rational Asset Manager.
FREE! Go There Now!
| | | |
WebSphere Process Server delivers a unique integration framework that simplifies existing IT resources. Often, as IT assets grow to support business demand, so too does their complexity and manageability. In this webcast, we’ll discuss how WebSphere Process Server helps deliver an SOA infrastructure that provides a common model to orchestrate, mediate, connect, map, and execute the underlying IT functions. Discover how WebSphere Process Server simplifies integration of business processes by leveraging existing IT assets as reusable services without the complexities of traditional integration methodologies.
FREE! Go There Now!
| | | |
Download the Rational Application Developer (RAD) v7.5 open beta code and start developing applications for the JEE5 standard which features EJB3.0, JPA, JSF 1.2, JSP 2.1 and Servlet 2.5 standards. When you use this beta you will see how you can increase developer productivity for already existing applications with improved support for refactoring, as well as adding new features to existing applications. In addition, the beta provides tooling for JD Edwards, Oracle, SAP, Siebel and PeopleSoft to improve the developer productivity with these enterprise systems.
FREE! Go There Now!
| | | |
Join this Rational Talks to You teleconference on November 29 at 1:00 pm ET to participate in an interactive discusssion with Grady Booch around architecture and reuse. Get your questions answered!
FREE! Go There Now!
| | | |
Try the latest version of IBM Rational Manual Tester V7.0.1 by downloading a free trial from IBM developerWorks. This manual test authoring and execution tool promotes test step reuse to reduce the impact of software change on testers and business analysts and addresses the needs of teams performing at least a portion of their testing manually.
FREE! Go There Now!
| | | |
Get a free trial download of the latest version of IBM Rational Method Composer V7.2 which helps you deliver customized yet consistent process guidance to your project teams and IT organization, and includes the latest version of IBM Rational Unified Process (RUP), which has provided process guidance to teams since 1996.
FREE! Go There Now!
| | | |
IBM Lotus Notes 8 provides a wide range of developers the ability to provide customized, integrated user interfaces via composite applications and via custom sidebar and toolbar plug-ins. This webcast provides you with tips and techniques to use with out-of-the-box capabilities of Lotus Notes 8, and survey how you can share useful components within your own company and within a larger community.
FREE! Go There Now!
| | | |
All FREE IBM® developerWorks Tools!
| |
/ 36 
