using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"(?:>|\s+)(?<word>@[a-zA-Z]\w+)(<|\s+)?";
string input = @"@word1 <p>ipsum dolor sit @word2 amet, consectetur adipiscing elit. Ut facilisis accumsan augue, <span>@word3</span>@word4 eget laoreet elit efficitur ut. sample@domain.com Fusce nulla ante, aliquam vel est sed, fringilla auctor risus. Ut consectetur mi non felis tincidunt, sit amet tincidunt massa placerat.</p>@word5";
foreach (Match m in Regex.Matches(input, pattern))
{
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