Try:
public static Regex regex = new Regex(
@"^\(_\d*\)\s*",
RegexOptions.IgnoreCase
| RegexOptions.Multiline
| RegexOptions.CultureInvariant
| RegexOptions.IgnorePatternWhitespace
| RegexOptions.Compiled
);
string result = regex.Replace(InputText,"");
Get a copy of
Expresso [
^] - it's free, and it examines and generates Regular expressions. It generated the code once I had tested the regex!