How to syntax-highlight a part of file in a different syntax?

Question

I installed bnf.vim (highlights BNF grammar files).

Suppose I have a comment in my code:

/* 

 :=  | h
 := a | b |          


        

Answer 1

You can use my SyntaxRange plugin for that.

Either explicitly assign the range, e.g.

:10,20SyntaxInclude bnf

or automatically based on the delimiting patterns:

:call SyntaxRange#Include('', '', 'bnf')