How to replace plain URLs with links?

Question

I am using the function below to match URLs inside a given text and replace them for HTML links. The regular expression is working great, but currently I am only replacing t

Answer 1

The e-mail detection in Travitron's answer above did not work for me, so I extended/replaced it with the following (C# code).

// Change e-mail addresses to mailto: links.
const RegexOptions o = RegexOptions.Multiline | RegexOptions.IgnoreCase;
const string pat3 = @"([a-zA-Z0-9_\-\.]+)@([a-zA-Z0-9_\-\.]+)\.([a-zA-Z]{2,6})";
const string rep3 = @"$1@$2.$3";
text = Regex.Replace(text, pat3, rep3, o);

This allows for e-mail addresses like "firstname.secondname@one.two.three.co.uk".