Can't use Regex from System.Text.RegularExpressions with UE 5 in Build.CS

[FilAl]

Hello.

Here is possible workaround in my answer:

UE5 Early access RegEx in Build.cs scripts not working

Hi, There seems to be an issue when I try to use C# regular expressions in the new UE5 build system - namely the Build.cs scripts with RegEx that were working in UE4 are not compiling in UE5. One of our clients investigated further and they said: “The Build.cs scripts cannot use Regex expressions due to a change in how they dynamically compile the Build scripts for .NET Core.” Is there a chance this is not working due to a bug / oversight to the new build system, or is this done intentionally…