How to find string between some characters using regex in c#

Question

Good day~ I am not really good at this regular expression. So I need your help, please.

Condition: Users can input their email addressed and name together. I want to extract email address and user name out of string.

string pattern1 = "Peter Jackson<[email protected]>";

From that string I want to get "Peter Jackson" and "<[email protected]>".

string pattern2 = "Peter Jackson([email protected])";

However, people always make mistakes like below.

And they can also use "[" instead of "<". so...

string pattern3 = "Peter Jackson[[email protected]]";

Even some stupid users can input like...

string pattern4 = "Peter Jackson{[email protected]}";

So, I had to look for the characters which are "<", "(", "[" and "{". I tried

string regularExpressionPattern = @"^(<|(|[|{)(.*?)^(}|]|)|>)";

But I think I've done something wrong. And I also try to think that people could input more mistake like....

string pattern5 = "Peter Jackson<[email protected]>mistake";

Could anyone help this problem? Advanced thanks.

PS: I know how to split string with a character. So it won't help. I needa proper regular expression.

It would help if you said what went wrong. (What did you expect to happen? What actually happened?) — Kendall Frey
– Kendall Frey, Commented Feb 24, 2013 at 2:03
Why not just ask for their full name and email address as two seperate inputs...? — vcsjones
– vcsjones, Commented Feb 24, 2013 at 2:03
@vcsjones Developing is not that simple job to do. Isn't it? ^^; — Joshua Son
– Joshua Son, Commented Feb 24, 2013 at 2:05
@KendallFrey As I mentioned in my question, I expect to abstract people's name and email address like "Peter Jackson" and "<[email protected]>". Even if they write "<", "(", "[" or "[". But with my expression, it returns blank. — Joshua Son
– Joshua Son, Commented Feb 24, 2013 at 2:06
Also, for regex questions, it's very helpful to have either A. a list of strings that should match the regex, and a list of strings that should not, or B. A string or list of strings, and a list of the substrings that should match. — Kendall Frey
– Kendall Frey, Commented Feb 24, 2013 at 2:06

Justin O Barber · Accepted Answer · 2013-02-24 02:10:41Z

1

I believe the regular expression you are looking for is as follows:

(.*?)[<([{](.*?)[>)\]}]

You would want group 1 and group 2.

answered Feb 24, 2013 at 2:10

Justin O Barber

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Kendall Frey · Accepted Answer · 2013-02-24 02:11:32Z

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(.*?)[([<{](.*?)[)\]>}]

I believe this should be adequate.

The name will be in the first captured group, and the email will be in the second.

answered Feb 24, 2013 at 2:11

Kendall Frey

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1 Comment

Joshua Son Over a year ago

Thanks to you, too. It also works. I didn't know about grouping with [].

Steven V · Accepted Answer · 2013-02-24 02:23:42Z

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Seems like (.*)[<\(\[{](.*)[>\)]}] works for me.

Groups for the name, and the email address as well.

http://regexr.com?33sq4 is my test.

edited Feb 24, 2013 at 2:23

answered Feb 24, 2013 at 2:11

Steven V

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