Why can't I find System.Text.RegularExpressions when using Mono on Linux?

Question

I am trying to use Mono and Monodevelop (IDE) to encode a C # project in Ubuntu.

Everything works regardless of the fact that System.Text.RegularExpressions (Package?) Was not found. The only thing I found in interwebs is here

There seems to be a kind of solution, but I don't understand. Please, help:)

Answer 1

In MonoDevelop, right-click the link and add the link to the System assembly.

You can use gmcs -r System *.cs to compile from the command line.

Answer 2

Same thing in VS2010. Just add a link to System if Assembly is missing.