using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"(?<!(?=((http|https|ftp|ftps?)\:\/\/?)(www\.?)))Nissan(?!(?:([$&+.,/:;\-_#=@?!a-zA-Z0-9](?!\s))+))(?=[^<>]*<)(?!(?:(?!</?(?:a|span)[ >/])(?:.|\n))*</(?:a|span)>)(?! (Micra|is))";
string input = @"<p>Nissan is car manufacter odoocompany.</p>
<p>Nissan</p>
<p>Nissan. Nissan, Nissan: 'Nissan' ""Nissan"" Nissan. </p>
<p>niss 'Nissan' niss</p>
<p>[Nissan] (Nissan)</p>
<p>Nissan! www.Nissan.com and www.Nissan.co.in/?nissan=/Nissan.php </p>
<p>Nissan! www.Nissan.com/nissanis/nissan01/nissan_-ABC/nissan.com</p>
<p>nissan.com/nissan.html nissan company Nissan Micra is product</p>
<p><a href=""www.Nissan.com"">Nissan</a> is company and <span><a href=""www.Nissan.com"">Nissan</a></span> Micra is product</p>
<p><span>Nissan</span></p>
<p>Nissan product <a href=""Nissan.com"">Nissan</a> ignore Nissan</p>
<p>nissan <a href=""Nissan.com""><span>Nissan</span></a> new nissan</p>
<p>odoo is a name Company and Nissan Micra is a model of best.</p>
<p>This is new <a href='https://www.Nissan.com'><span>Nissan</span></a> micra of micra nissan is company.
nissan is a company.</p>";
RegexOptions options = RegexOptions.IgnoreCase;
foreach (Match m in Regex.Matches(input, pattern, options))
{
Console.WriteLine("'{0}' found at index {1}.", m.Value, m.Index);
}
}
}
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for C#, please visit: https://msdn.microsoft.com/en-us/library/system.text.regularexpressions.regex(v=vs.110).aspx