String manipulations

Hello,

In a column I have data like

M:\bep\BU3\cat5\Features\BU3-Feates\2-PDAC\Airmodules\A_BLOWELEMENTS\BLDCBLOWEOUNT\SFBLDCBLOWER-MOUNT_V7

I just want to extract data “A__BLOWELEMENTS”.

It may be start with B_ or C or D_. Wanted to extract data from between backslash.

I tried with this " regexExtract($Location$,“(?<=\).?__.?(?=\))”) but it will not working