I am having 2 strings with 2 different variables.
vRegular = 'Country'
vBold = 'India'
I want to concatenate above 2 variables in a single string but with first string('Country) in regular font and second string in Bold font (India).
Not possible as one string / field as far as I know.
But the question is: What is it that you are really trying to achieve? If we know that, we might have an alternative solution for you .
Most easy way to achieve this is:
-write your content in MS Office (with all formatting)
-take screenshot and edit the part required to be shown,
-display this in a textbox in the qvw.
It's not possible with the inbuilt features. If you don't want to use the suggestion from kush141087 you could use as alternatively:
to emphasize one part of your concatenation.