using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"[Nn]issan(?=[^<>]*<)(?!(?:(?!</?(?:a|span)[ >/])(?:.|\n))*</(?:a|span)>)";
string input = @"nissan
Company name nissan and Nissan Micra product.
<p>Company name nissan and Nissan Micra product.</p>
You know Nissan become now http://www.nissan.com.
<p>www.nissan.com </p>
<p>Now nissan become now www.nissan.com</p>
<p>Hello you know Nissan is Now nissan become now www.nissan.com</p>
";
RegexOptions options = RegexOptions.IgnoreCase | RegexOptions.Multiline;
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