gistfile1.txt

Pegex rules are of the form:

    name: /foo/ [ <bar> | `baz` ]

/foo/ - is a pcre regex.
<bar> - is a named subrule.
`baz` - is an error msg
[ ]   - is a sub group

Some of the above can have prefixes and suffixes:

    name: <a>? <b>* <c>+ !<d> =<e> .<f> +<g> -<h> .<i>*
          [ <j> <k>]?

?*+ - are obvious
!   - negative lookahead
=   - positive lookahead
.   - ignore if no action
+   - force wrap action
-   - force no wrap action

I currently have a separator operator:

    name: <a> ** <b>

and I can do zero or more with:

    name: [ <a> | <b> ]? ** <c>

Since the ?*+ of the two sides are not very important in this use case, I just
special cased that. Note I used a gratutitous group in the last example to
show I can do that too.

Given my setup, I am now inclined to not allow suffixes on the left or right operands and to do all the use cases with the infix operator.