Fixes issue ggordan#93 [Lots of random "red dots" showing up in the g…

…utter]

line.py

@@ -205,7 +205,7 @@ def color(self):
   def generate_webcolors(self):
     """Generates a list of web color names."""
     self.WEB_COLORS = dict((name, color) for (name, color) in css3_names_to_hex.items())
-    self.WEB_COLORS_REGEX = '((?<!\$)'+ '|(?<!\$)'.join(self.WEB_COLORS.keys()) +')'
+    self.WEB_COLORS_REGEX = '[\\s:](' + '|'.join(self.WEB_COLORS.keys()) + ')[\\s;]'
 
   def web_color(self):
     """Returns the color in the line, if any CSS color name is found."""