I have a simple question i know this is basic but i can't get the right expression.

Code:
/^.*:\s+.?.?(one|two).?.?\s*$/i
That regex can answer this to get the answer "one":
!@one_!
My question is if the output is like this

!@o2ne_1
What would be my expression to get only the answer "one"?
How can i disregard the 2 there inside the "one" word.