Extract substring with Regex

Question

im trying to extract a substring with regex but im having some troubles...

The string is build from a columns of strings and i need the the 4th column only

string stringToExtractFrom = "289  120 00001110 ?? 
4Control@SimApi@@QAEAAV01@ABV01@@Z = ??4Control@SimApi@@QAEAAV01@ABV01@@Z 
(public: class SimApi::Control & __thiscall SimApi::Control::operator=(class 
SimApi::Control const &))"
string pattern = @"\s+\d+\s+\d+\s+\S+\s(.*)\=";
RegexOptions options = RegexOptions.Multiline;

Regex regX = new Regex(pattern, options);
Match m = regX.Match(stringToExtractFrom);

while (m.Success)
{                       

 Group g = m.Groups[1];
 defData += g+"\n";
 m = m.NextMatch();
}

this is the wanted string: ?? 4Control@SimApi@@QAEAAV01@ABV01@@Z

with the string below it worked when i got the substring i want as a group

1 0 00002E00 ??0ADOFactory@SimApiEx@@QAE@ABV01@@Z = ??0ADOFactory@SimApiEx@@QAE@ABV01@@Z (public: __thiscall SimApiEx::ADOFactory::ADOFactory(class SimApiEx::ADOFactory const &))

Answer 1

If the second string works for you and the first one does not, you might first match 1+ digits and use \\S+ for the third part. Then use a negated character class to capture matching not an equals sign:

\d+\s+\d+\s+\S+\s+([^=]+) =

See a .NET regex demo | C# Demo