Find adjacent lines starting with same pattern

Hi there

I'm optimising a css file.
I run the file through csscomb to clean it up and i would like to highlight duplicated properties.

ex:

body {
margin: 10px;
padding: 10px;
padding: 20px;
background: #fff;
}

I can find duplicated lines with:
/^\(.*\)\n\1$

I can match and capture the properties on every lines:
\S\{-}:\)

I can match the whole line and capture the properties and value:
\(\S\{-}:\)\(.\{-};\)

But if i try to to apply the pattern on the next line ( \n\1 ) it doesn't match anything:
\(\S\{-}:\)\(.\{-};\)\n\1

Is there a way to do that?

Thanks a lot

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