thomas carlier ڧѧ 16.01.2012 11:48:
> Hi,
>
> I need to write an easy parser and i don't know if i can use an 
> existing
> library.
>
> Thanks

Try Treetop:
http://treetop.rubyforge.org/

You may find one of my blog posts useful:
http://whitequark.org/blog/2011/09/08/treetop-typical-errors/

-- 
   WBR, Peter Zotov.