Copy Track number in filename to track tag

I can get the filename itself to pass into the track tag via actions with format value of > field : track to format string : %_filename%

That will force file name into track tag. But all I want is the 01 part of the file name to enter into the track tag.

01 (Tony Toni Tone) Feels Good.mp3

I've tried ^.{2}%_filename% to the field and variants to %track% but nothing seems to work.

What am I missing?

Can someone help me out?


I figured it out.....

New action: Guessing Value

Source format > %_filename_ext%

Guessing Pattern > %track% %dummy%

Filled in track with the leading track number with space delimiter.