Precedence documentation seems missing

[darioteixeira]

I think the documentation about precedence of the various regexp operators is missing. For instance, does Star r1, r2 parse as Star (r1, r2) or (Star r1), r2?

[alainfrisch]

The concrete syntax is the one of OCaml patterns, following their precedence. So Star r1, r2 is (Star r1), r2.

[pmetzger]

Probably worth documenting anyway. I've had this same question. At the very least, that one two sentence reply (i.e. "The concrete syntax is the one of OCaml patterns...) would have saved me a few minutes.