Help with regex

Help
1

I am using Regex.

E.G.
S Storage (SATA, 200GB)
S Storage (SAS, 200GB)

Regex used: \S+\s+\d+(?=GB)

Current Outcome:
image

Expected Outcome:
SATA
SAS

Only constant is the bracket before the word but it won’t work-(?=()

Any ideas how can I get my expected outcome?

Thank you xoxo

2

Is it always in caps? This works for the given examples:
[A-Z]+(?=, \d+GB)