C# CSS Classname Regex

As promised, although a little late I have updated the Regex to get CSS classnames via C#. The problem I had was that it would find file extensions in a url specified by the "url(xyz.png)" in an attribute.

I added a little negative look behind and now it seems to work prety well:

string css = @"
.someclass
{
background: white url(someimage.png) repeat-x top left;
}
.someclass2
{
background: white url ( someimage.png) repeat-x top left;
}
";
MatchCollection arr = Regex.Matches(css, @"(?<!url\s*\(.*)(\.[-]?[_a-zA-Z][_a-zA-Z0-9-]*|[^\0-\177]*\\[0-9a-f]{1,6}(\r\n[ \n\r\t\f])?|\\[^\n\r\f0-9a-f]*)");
string class1 = arr[0].Value;
string class2 = arr[1].Value;

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