using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"(?<!`)((?:``)*)\$\(";
string substitution = @"$1`$$(";
string input = @"<!doctype html>
<html lang=""en"">
<head>
<body>
text
$computername
$username
text
$('unescaped')
`$('pre-escaped')
``$('unescaped')
```$('pre-escaped')
````$('unescaped')
</body>
</html>
";
RegexOptions options = RegexOptions.IgnoreCase;
Regex regex = new Regex(pattern, options);
string result = regex.Replace(input, substitution);
}
}
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