Remove specific lines in a multiline textbox

Question

I have a Multiline textbox who I can paste URL's. The URL's will be paste into a string variable. Now I want, that just URL's from a specific domain can pass into the string variable.

For example:

http://domain-1.tld/gfdgfd.php?=2135346432
http://domain-2.tld/fsefes.php?=2145312542
http://domain-1.tld/random/folders/iwadaex.php?=2112313543
http://domain-2.tld/igewex.php?=2135464432
http://domain-1.tld/folder/inwadawx.php?=2135546432
http://domain-2.tld/ihtfhtf.php?=2143534432

I a have a radiobutton with Domain 1 and Domain 2 . If Domain 1 is checked, Only URL's from Domain 1 will be put in the variable, and so on.

I just need to know, how I filter the URL's...

Answer 1

var result =  textBox1.Text.Split('\n').Where(x => x.Contains(@"http://" + domain)).ToArray();

在您的评论后编辑：

var str = String.Join(Environment.NewLine, result);

Answer 2

You can get your lines using Lines property then filter them using Where method:

var filteredUrls = textBoxName.Lines.Where(x => x.Contains(someValue)).ToArray();

Then if you want to display them together, you can use String.Join

var output = string.Join(Environment.NewLine, filteredUrls);