Regex Samples

using System.Text.RegularExpressions;

detect a URL: Regex urlregex = new Regex(@"(http:"/"/(["w.]+"/?)"S*)", RegexOptions.IgnoreCase|RegexOptions.Compiled);
regex for Detecting urls

^((ht|f)tp(s?))"://([0-9a-zA-Z"-]+".)+[a-zA-Z]{2,6}(":[0-9]+)?(/"S*)?$

^(?((?http:"/"/)*(?(www|[^"-"n]*)*)(".)*(?[^"-"n]+)".(?[a-zA-Z]{2,3}[^>"n]*)))$

^(?((?http:"/"/)*(?(www|[^"-"n]*)*)(".)*(?[^"-"n]+)".(?[a-zA-Z]{2,3}[^>"n]*)))$

^[http://www.|www.]["S]+$

detect a Email: Regex emailregex = new Regex(@"([a-zA-Z_0-9.-]+"@[a-zA-Z_0-9.-]+"."w+)", RegexOptions.IgnoreCase|RegexOptions.Compiled);