[cybmole]

sounds great in theory but is not finding all the matches in my simple test file ?
e.g. it is skipping this line :
line-height:1.3
i think it needs a tweak to allow for no trailing semicolon ?

for testing, I created a blank stylesheet & put in

line-height:1.2;
line-height:1.3
line-height:1.2em;
line-height:1.2em
line-height: 1.9;
line-height: 1.4
line-height: 1.2em;
line-height: 1.2em
line-height:1.9;
line-height:1.4
line-height:1.2em;
line-height:1.2em

also your code works for the same reason as my cheat, it looks for a final mandated whitespace. if I remove that from your code then the find picks out only the bold part of
line-height:1.2em

the hard bit is getting the optional components to be included in what is captured, and allowing the final bit of the target to be an optional string