[BU05] Setting up multiple builds easily using build variants

I am having trouble using terminus with it.
without terminus it runs, but it is not interactive.

I have tried a gazillion times to reply your comment asking me to provide a pastebin link to the output Borland 5.5.1 serves. Every time the comment gets vanished, IDKW.

One good thing you did leaving me in a limbo, I taught myself how to write regex, the buildfile and the workarounds. I can now make any build as far as I can understand how the compiler or the interpreter with its associated files work. The tutorials here on this channel are rather more confusing than informative and userfriendly. The official documentation of sublime text is also s****. Better documentation could have made the lives of a lot of people easier. Not buying sublime software anymore. Thanks but no Thanks OdatNurd. Unsubbing the channel. See you on other platforms, I mean stackOverflow, Sublime Forum, etc.

I am racking my mind on how to create regular expression (regex), specifically file_regex for creating a build system for compiler that is no more in vogue. I am talking about Borland 5.5.1 commandline compiler. Yes I know it is old and I am supposed to use gcc c++17 standards but I am restrained to use the borland. OdatNurd can you help me out with that?
I am new to the concept of coding custom Sublime Build System file.

first!