Select a HostName with Regex in C#?

Question

There are some addresses as follows :

http://rs320tl.rapidshare.com/files/119371167/sth.rar

I'm gonna select rs320tl.rapidshare.com with Regex, but I'm not familiar with Regular Expressions.
Would you please guide me ?

Thanks.

PS.
rs320tl in the address is variable.

SLaks · Accepted Answer · 2010-02-19 04:19:38Z

4

You should not use regular expressions to do this.

Instead, use the Uri class:

Uri uri = new Uri(yourString, UriKind.Absolute);
string host = uri.Host;

If you want to check whether the string is acutally a URL, use the following code:

Uri uri;
if (!Uri.TryCreate(yourString, UriKind.Absolute, out uri))
    //String is not a valid URL.  Waah waah waah
string host = uri.Host;

answered Feb 19, 2010 at 4:19

SLaks

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3 Comments

Mohammad Dayyan Over a year ago

Thanks, but what about the Regex one, Would you please post a regular expression to do that.

Mohammad Dayyan Over a year ago

Are you sure! it selects whole of the address!

SLaks Over a year ago

You need to use the capture group.

Ken · Accepted Answer · 2010-02-19 05:18:06Z

3

If you really want to go down the Regex/C# route, I think what you are looking for is something like this:

string sOriginalUrl = "http://rs320tl.rapidshare.com/files/119371167/sth.rar";
string sPattern = "http://(?'host'[0-9a-zA-Z-.]*)/.*";
Regex re = new Regex(sPattern, RegexOptions.ExplicitCapture);
string sHost = re.Match(sOriginalUrl).Groups["host"].Value;

answered Feb 19, 2010 at 5:18

Ken

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Comments

rerun · Accepted Answer · 2010-02-19 04:24:45Z

1

"//(\w.*?\w)/" group[1] will have your url

answered Feb 19, 2010 at 4:24

rerun

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2 Comments

Mohammad Dayyan Over a year ago

Are you sure about the expression! I wanted to test it, I receive this error Unrecognized escape sequence for w

SLaks Over a year ago

You need to put an @ before the string.

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