Url and Email validation using Regex

using System;
using System.Text.RegularExpressions;

public class GeneralValidation
{

    public static bool IsEmail(string Email)
    {
        string strRegex = @"^([a-zA-Z0-9_\-\.]+)@((\[[0-9]{1,3}" +
            @"\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([a-zA-Z0-9\-]+\" +
            @".)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$";
        Regex re = new Regex(strRegex);
        if (re.IsMatch(Email))
            return (true);
        else
            return (false);
    }

    public static bool IsUrl(string Url)
    {
        string strRegex = "^(https?://)"
        + "?(([0-9a-z_!~*'().&=+$%-]+: )?[0-9a-z_!~*'().&=+$%-]+@)?" //user@
        + @"(([0-9]{1,3}\.){3}[0-9]{1,3}" // IP- 199.194.52.184
        + "|" // allows either IP or domain
        + @"([0-9a-z_!~*'()-]+\.)*" // tertiary domain(s)- www.
        + @"([0-9a-z][0-9a-z-]{0,61})?[0-9a-z]\." // second level domain
        + "[a-z]{2,6})" // first level domain- .com or .museum
        + "(:[0-9]{1,4})?" // port number- :80
        + "((/?)|" // a slash isn't required if there is no file name
        + "(/[0-9a-z_!~*'().;?:@&=+$,%#-]+)+/?)$";
        Regex re = new Regex(strRegex);

        if (re.IsMatch(Url))
            return (true);
        else
            return (false);
    }
}