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You can find some on http://www.textpad.com/add-ons/synu2z.html . I have used the latest one (Syntax definitions for systemverilog: Contributed by Colm Mc Sweeney, 9 November 2006. ) and it is good. I think it is a little late for you, but I am writting it for other people searching for Verilog ...

I think it is a good idea to have Octal Prefix and Binary Prefix line in [Syntax] section of Syntax Definition Files (.syn files) like HexPrefix which we have it now. One of the examples are Verilog and VHDL (Hardware Design & Simulation Language). We have: 8'b10101010 means 8 bits binary 10101010 ...