I need a regex to use in a C# App with the follow structure: domains separated by semicolon Valid Example: domain1.com;domain2.org;subdomain.domain.net How can i do that with a single Regex?

Reputation: 583

Regex : domains separated by semicolon

I need a regex to use in a C# App with the follow structure:

domains separated by semicolon

Valid Example:

domain1.com;domain2.org;subdomain.domain.net

How can i do that with a single Regex?

Upvotes: 1

Answers (6)

Steven

Reputation: 1280

Using Mr. Disappointment's suggestion, I don't know what all the Uri.IsWellFormedUriString method does, but, in theory, if you want to perform both steps (separate and validate) in one, I would think you could use LINQ to do something like this:

(editted this to use Uri.CheckHostName instead of Uri.IsWellFormedUriString)

string src = "domain1.net;domain2.net; ...";
string[] domains = src.Split(';').Where(x => Uri.CheckHostName(x) != UriHostNameType.Unknown).ToArray();

Upvotes: 0

Spooks

Reputation: 7187

You can use [^;]+ but C# has a split function which will work well for this(if you can avoid regex I would do so)

http://coders-project.blogspot.com/2010/05/split-function-in-c.html

Upvotes: 0

Oleks

Reputation: 32333

Just:

var domains = example.Split(";".ToCharArray(), 
                  StringSplitoptions.RemoveEmptyEntries);

Upvotes: 3

Grant Thomas

Reputation: 45083

Given my aversion to regex in general, I am compelled to post an alternative (banking on the fact that you're going to need the individual domain representations as separate entities at some point anyway):

string[] domains = delimitedDomains.Split(';');

Where delimitedDomains is a string of domains in the format mentioned and the result being an array of each individual domain entry found.

It may well be that there are more cases to your scenario than precisely detailed, however, if this is the extent of your goal and the input then this should suffice quite well.

Upvotes: 3