From: vikkous <google@...>
Date: 2005-04-26T09:49:37+09:00
Subject: Re: Announcing Reg 0.4.0

itsme213 wrote:
> - can I bind variables to (parts of) matches

I guess what you're asking for is like the functionality of
backreferences, which aren't implemented yet. Binding a variable is
somewhat different, I guess but allows you to do the same sort of
thing. It could be implemented, not necessarily easily for global vars,
and maybe for others too using Binding.of_caller.

> - any convenient way to match "all" ... like r*(size..size)

Uhh... well, OB matches any single object and OBS matches 0 or more of
any object. One great thing about reg is that you can name your own
subexpressions if you happen to need a matcher that matches -[some long
reg that I dont want to type over and over], you can write:
   foo=-[some long reg... etc]
and then use foo everywhere in your larger reg. This is a major
weakness of regexps, and was one of the great things about gema in
comparison.

For instance, modulo optimizations, the definitions of OB and OBS are:
  OB=Object.reg
  OBS=OB+0