Grep to replace only part of the found text

I'm using ^.+~> to search the begging of a paragraph up to an EN space, but is it possible with GREP to format just PART of the string found?
There are roman numerals that precede a period and an EN space and I want to apply formatting to just the roman numerals, leaving the period and EN space alone.
I did found one post that mentions using "some" but I'm not familiar enough with GREP to know how it works.
Can anyone commend a good source for GREP coding?
Thanks,
Ken

Try this:
^(.+)(?=\.~>)
I just changed your original code to use the period and en-space as a positive lookahead -- it'll only find characters at the beginning of the line if they're followed by a period and an en-space, but will not include them as part of the found text.
If these items all have the same paragraph style applied to them and that style isn't used anywhere that you wouldn't want the formatting, I'd also consider setting this up as a GREP style. You could also do it as a nested style applying your character style up to (.~>). (Don't include the parantheses - I was just trying to make it clear what the expression to use is.)
Hope that helps.

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Grep to replace only part of the found text

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