使用正则表达式替换字符串 c# 中的 URL

Question

Hi all trying to use a regex to replace some URLs that are inside of a textbox but think I've set this up incorrectly.

So my message would look like this:

Hey check out this site http:\www.anywhere.com

What I'm trying to do would be replace the link with URL Quarantined like the below and then add the replaced URL to a list:

Hey check out this site URL Quarantined

This is my code below:

        public void QuarantineURLS()
        {
            var listURLS = new List<string>();

            var urlReplace = new Regex(@"\b(https?://|www\.)\S+(?=\s|[^\P{P}?]|\z)", RegexOptions.Compiled | RegexOptions.IgnoreCase);
            txtContentClean.Text = urlReplace.Replace(txtContent.Text, "<URL Quarrantined>");
        }

However the output I'm getting looks like this:

Hey check out this site http:\URL Quarrantined

Would anyone be able to show me how to implement this correctly

Answer 1

Using the Replace method, you could make use of a callback.

Note that your url in the question has \\ instead of //

As an example, using the pattern from the question:

var listURLS = new List<string>();
var txt = "Hey check out this site http://www.anywhere.com";
var urlReplace = new Regex(@"\b(https?://|www\.)\S+(?=\s|[^\P{P}?]|\z)", RegexOptions.Compiled | RegexOptions.IgnoreCase);
var txtClean = urlReplace.Replace(txt, m => {
    listURLS.Add(m.Value);
    return "<URL Quarrantined>";
});
Console.WriteLine(txtClean);
listURLS.ForEach(i => Console.Write("{0}\t", i));

Output

Hey check out this site <URL Quarrantined>
http://www.anywhere.com