Improve company productivity with a Business Account.Sign Up

x
?
Solved

Checking legal email address string

Posted on 1998-07-03
5
Medium Priority
?
306 Views
Last Modified: 2012-05-04
In my C++ program I need to check whether or not a string is a legal email address.
Does anyone know if there is a library function somewhere for doing this, and if
not, what are the rules for this function.
0
Comment
Question by:kaplan1
5 Comments
 
LVL 85

Expert Comment

by:ozo
ID: 1167140
0
 

Expert Comment

by:kashif063098
ID: 1167141
hi!
I think you need to check for few things in the string

1- '@' sign
2- '.' after @ sign
3- look for .net,.gov,.com,.org

i think you already know this

0
 

Expert Comment

by:dst
ID: 1167142
Here are some rules:

1. There must be no blank spaces.
2. There must be one (and only one) '@'-sign.
3. Only letters, numbers and following characters allowed:
   hyphen (-), dot (.) and underscore (_).
4. The part after the '@'-sign must contain at least one dot (.).

   I hope you will find it usefull.
0
 
LVL 1

Accepted Solution

by:
saneesh100 earned 200 total points
ID: 1167143
Hello..

 You can do a lot of things.
First check for @ sysmbol and there should be only one but one is needed..

 ALso the second part contailns the name of the server for eg
xxx@hotmail.com menas he is a member of hotmail server.U can quesry to the nearest DNS server to find it's MX exchange servers name for eg mail.hotmail..com in the case of hotmail .THen u can connect to that server on port 25 and query if the user ( the part before @) is valid..

 It is the safest and reliablle method and will work correctly..

0
 
LVL 85

Expert Comment

by:ozo
ID: 1167144
The proposed rules are incorrect.
More than one @ can appear in a valid email address,
as can blank spaces, or any other character when properly quoted.
0

Featured Post

Keep up with what's happening at Experts Exchange!

Sign up to receive Decoded, a new monthly digest with product updates, feature release info, continuing education opportunities, and more.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

Join & Write a Comment

This article will show you some of the more useful Standard Template Library (STL) algorithms through the use of working examples.  You will learn about how these algorithms fit into the STL architecture, how they work with STL containers, and why t…
IntroductionThis article is the second in a three part article series on the Visual Studio 2008 Debugger.  It provides tips in setting and using breakpoints. If not familiar with this debugger, you can find a basic introduction in the EE article loc…
The viewer will learn how to pass data into a function in C++. This is one step further in using functions. Instead of only printing text onto the console, the function will be able to perform calculations with argumentents given by the user.
The viewer will learn how to use the return statement in functions in C++. The video will also teach the user how to pass data to a function and have the function return data back for further processing.

595 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question