want to extract a substring from string

Question

2.78/5 (3 votes)

See more:

hii
i have a string abc@gmail.com
i want to extract only gmail from it
how can i search of index till i reach @ and how can i search for index till i get .
and then i extract gmail from it..
help

Posted 4-Jul-13 7:25am

Rajan Maheshwari

Updated 4-Jul-13 7:29am

v2

Add a Solution

Comments

[no name] 4-Jul-13 13:31pm

Have you tried IndexOf?

3 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Sergey Alexandrovich Kryukov · Answer 1 · 2013-07-04T07:35:00

Solution 1

First of all, if you cannot extract a substring from a string not asking any questions, you are not ready to work with mail and any other advanced stuff, including UI. You should do elementary exercises in programming basics using simplest console-only applications, which should take considerable amount of time.

In this case, you could use string.Split:
http://msdn.microsoft.com/en-us/library/system.string.split.aspx[^],
http://msdn.microsoft.com/en-us/library/system.string.aspx[^].

—SA

Posted 4-Jul-13 7:35am

Sergey Alexandrovich Kryukov

Comments

Rajan Maheshwari 4-Jul-13 13:40pm

string email_id = TextBox1.Text;
index1 = email_id.IndexOf('@');
index2 = email_id.IndexOf('.');
email_id = email_id.Substring(index1 + 1);
but here i only get upto gmail.com
how to remove .com from it.coz i cant work with text length as the ids canbe live.com hotmail.com etc etc

[no name] 4-Jul-13 13:45pm

Yes you would have to SubString again using index2....

Sergey Alexandrovich Kryukov 4-Jul-13 13:53pm

It looks like you did not read my answer. Don't do it.
Also, such question does not deserve any discussion. You need to do it all by yourself, just reading MSDN documentation.
—SA

Rajan Maheshwari 4-Jul-13 13:49pm

but the problem is substring have only two overloaded methods in which we cant delete a string from back...
it has (int len)
(int len,start index)

Sergey Alexandrovich Kryukov 4-Jul-13 13:55pm

You don't understand one basic thing: nothing can delete anything from a string. Strings are immutable. Surprise?
—SA

Rajan Maheshwari 4-Jul-13 13:59pm

int index1 = 0, index2 = 0;
string email_id = TextBox1.Text;
index1 = Convert.ToInt32(email_id.IndexOf('@'));
index2 = Convert.ToInt32(email_id.IndexOf('.'));
email_id = email_id.Substring(index1 + 1);
index2 = email_id.IndexOf('.');
int len=email_id.Length;
email_id = email_id.Substring(0, len-4);
Label5.Text = email_id.ToString();

I have solved it man...be cool.. i knw what is asp.net and i know how to code..
I have already made some websites. But you know sometimes silly things happen friend
Dont get angry friend..I am not good in English and i was unable to explain my problem to you..That might be the reason.

Sergey Alexandrovich Kryukov 4-Jul-13 14:04pm

You English is not a problem to me. I'm not angry, why? Again, you don't need Substring, you need Split.
—SA

Rajan Maheshwari 4-Jul-13 14:10pm

just i am here to learn something..whether the doubt is stupid or useless or whether it is very high rated..i just enjoy asking them and clearing also. I will definitely use split as you say..but substring is also working fine with me.
Thanks

Manfred Rudolf Bihy 4-Jul-13 14:24pm

It just might be that OP percieved you as being angry or pissed off as your statements towards noobs is often derogatory. I don't think there is really a reason behind putting someone down just because we think he/she is asking stupid questions. In fact I was once told that there is no such thing as a stupid question, but there's more than a share of stupid answers. We as a community should rather entice our clients to start asking the right questions instead of treading upon them.
We are here to help after all and not bolster our egos. Sometimes nudging them into the right direction goes better than just bashing them.

My two bits! Even tough there seem to be some that just refuse to be helped.

Rajan Maheshwari 4-Jul-13 14:54pm

Its very true..thanks Manfred R. Bihy..the people like you only motivates us and you are only the person who shows us the way in which we can do something better for our life.These forums are there to help us and not to make derogatory comments
Thanks for the support
Regards

Sergey Alexandrovich Kryukov 4-Jul-13 15:33pm

Please see my comment below. I think you should understand my answer as help, not as personal attack. If you read it without any back thought you might be preoccupied with, you will find only too practical advice pieces: on how to solve your problem, exactly, and another one, on what you should do instead. I still think you should follow both, for your own sake.

Wish you the best of luck,
—SA

Sergey Alexandrovich Kryukov 4-Jul-13 15:31pm

I do understand your motivation but I seriously think that the best help to some people is some kick. This is my view on this matter which cannot be shaken too much by arguments like yours, because I receive too convincing confirmation: in practice I see many cases when it really helps.

Your "there is no a stupid question" is no more than a maxim, a figure if speech. In reality, I think we both understand that anything can be stupid.

And of course, OP's question is not really stupid, it's just lazy. A little effort from OP's side gave some result. This is yet another reason confirming my approach. This is what really works, and this is what I can see from practice, not from comments. You cannot deny that I answered the question, but my first paragraph is an integral and most important part of it.

Also, let me point out that "refuse to be helped" is totally not true. I provided a working advice, and OP is supposed to try it first, instead of following a different line. To get help, one should not ignore the advice. This part of your message is completely unjust, I think you wrote it in irritation, instead of getting to the facts.

And the hole idea of perceiving it as "putting down" is just false. This is nothing but a practical advice on what to do, more important than the matter in question. Probably even OP took it more positively than you did.

Whatever we disagree on, I appreciate your comment and your arguments.

Thank you,
—SA

Rajan Maheshwari 5-Jul-13 11:04am

you did nothing wrong..what you did is you directly asked to go through programming basics and provided a link without answering my question.
Secondly you self assumed that the other person doesn't know basics of programming if hes asking such a question
Finally, what you did is only war of words and till you haven't provided any solution to the problem mentioned in the question.
Anyways thanks for your important time for posting on my post.
Have a nice day

Sergey Alexandrovich Kryukov 5-Jul-13 21:43pm

You are welcome. However, "without answering my question" is a plain lie. No matter. Who do you think is a looser here? You are putting yourself in a position to avoid learning and doing good thing by such attitude, but this is your own choice.
Wish you the best of luck.
—SA

Rajan Maheshwari 6-Jul-13 10:00am

its very true....i said that day also and today also that you didn't provided the answer.You just provided a link which consisted of various string functions.Anyways looser is quite a derogatory remark about someone.Your are here to help in this forum.So better use your designation well out here.
Wish you the best of luck.

Sergey Alexandrovich Kryukov 6-Jul-13 13:40pm

"Just..."? Why do you think it's not enough? Even if it wasn't, all you had to do was just to ask another question. Instead, you started to scandal.

Please, pay attention: you are inventing the reasons to get offended. "Looser" has several meanings, only some of them are derogatory. You need to be reasonable, if you expect people to argue with your seriously. You see, all in this discussion is insignificant, except just one thing: you really, really need to learn what I advised, and probably a lot more. You need to learn, not protect you from learning. I really hope that in practice this is what you are going to do.

—SA

[no name] 4-Jul-13 13:59pm

Yes and how is that a problem? string domain = email_id.SubString(index2 -1, 0); will give you what you want.

Rajan Maheshwari 4-Jul-13 14:03pm

index2 variable is unused in the code...

Shakti Shrinet · Answer 2 · 2013-07-04T08:29:00

Solution 2

C#

string Source = "abc@gmail.com";
char[] dest;
Source.CopyTo(3 ,dest,0,4);
console.write(Source);
console.writeline(dest);

Posted 4-Jul-13 8:29am

Shakti Shrinet

Updated 4-Jul-13 8:33am

v2

Comments

Rajan Maheshwari 4-Jul-13 14:47pm

btw i have solved it but again u never know what is the email address
If i enter abcdef@gmail.com ur above code is failed............

Shakti Shrinet · Answer 3 · 2013-07-04T10:46:00

Solution 3

yeah i know what is email you should try it

C#

string s = "sk.shrinet@gmail.com";

           string[] words = s.Split('@');
           foreach (string word in words)
           {
               Console.WriteLine(word);
           }

Posted 4-Jul-13 10:46am

Shakti Shrinet

Comments

Rajan Maheshwari 5-Jul-13 6:42am

this also only gives gmail.com
I only want gmail to be printed.........