To check given String is Url or not using Regular Expression

Hi everyboday,
Few days back my friend ask me abt validating a  string that it contain a url or not.
Visual stdio is giving us a in-build option to check this so what v need is to cal this control on server side and validate it Simple :) 

To call Regular Expression on server side v need to add a name space
using System.Text.RegularExpressions;

validate URL's without http

 

Private bool ValidateUrl(string url)

{

// regex pattern for url validation string

Regex RgxUrl = new Regex("(([a-zA-Z][0-9a-zA-Z+\\-\\.]*:)?/{0,2}[0-9a-zA-Z;/?:@&=+$\\.\\-_!~*'()%]+)?(#[0-9a-zA-Z;/?:@&=+$\\.\\-_!~*'()%]+)?");
if (RgxUrl.IsMatch(url))
{
return true;// string url contain valid url
}
else
{
return false;// string url contain invalid url
}

}

validate URL's with http

 

Private bool ValidateUrl(string url)

{
System.Globalization.CompareInfo cmpUrl = System.Globalization.CultureInfo.InvariantCulture.CompareInfo;
if(cmpUrl.IsPrefix(txtUrl.Text, "http://") == false)
{
txtUrl.Text = "http://" + txtUrl.Text;
}
Regex RgxUrl = new Regex("(([a-zA-Z][0-9a-zA-Z+\\-\\.]*:)?/{0,2}[0-9a-zA-Z;/?:@&=+$\\.\\-_!~*'()%]+)?(#[0-9a-zA-Z;/?:@&=+$\\.\\-_!~*'()%]+)?");
if (RgxUrl.IsMatch(url))
{
return true;
}
else
{
return false;

}

}

Have a nice day... 'N happy Coding :)