I needed a url pattern that recognizes the following urls:
http://site.com
www.site.com
https://site.com
https://www.site.com
Even more, I wanted after url detection, it to be replaced with:
http://site.com -> http://site.com
www.site.com -> http://www.site.com
https://site.com -> https://site.com
https://www.site.com -> https://www.site.com
I use Regex’s Replace method. It detects all urls and replaces them with the correct format. Here is the full example:
string originalText;
…
string convertedText = Regex.Replace(originalText,
@”((http(?<http1>(s?))://(?<www1>(www.)))|(http(?<http2>(s?))://)|((?<www2>(www.))))(?<url>([wd:#@%/;$()~_?+-=\.&]*))”,
@”http${http1}${http2}://${www1}${www2}${url}”);
…
P.S. I hope that the example above could be useful to someone else, too. If you find some bug or suggestion, I’ll be very thankful to hear how it can be fixed 