Suggestions for changing tab with underline leader

Question

I frequently create forms where I'll use a tab with the underline for the leader, e.g., Name_________________  Age___________, etc.
I like the line to be thinner than the text, say the text is 10pt I'll change the line to 8pt. I can do a Find/Change to change the Tab character to a smaller size, but that changes every tab whether it has a leader or not. I can't find a way to "Find every tab with a leader that's the underline and reduce the point size".
Any suggestions appreciated.
Geoff

Answer 1

Jongware said: " \K must be "New! Now in InDesign CC 2014!"; and possibly earlier, but not as early as CS4. "
Wow.
Just tested \K and \R
Working in:
CS6 v8.1.0
CC v9.3.0
CC v10.2.0
\R
is finding any line end sequence (all vertical whitespace?)
One example with some line ends in sequence:
[return] [return newline] [newline] [newline] [newline] [return] [return newline]
will give you seven matches.
(In contrast to \v that will give you nine matches.)
Also tested in CS5.5, but no luck here…
Uwe