From: John Ky <newhoggy@...>
Date: 2006-10-13T14:50:59+09:00
Subject: Re: Ruby equivalent of assemble RE?

Sounds interesting, can I have a look at the source code?  I may just
be interested in rewriting it in ruby.

Thanks

-John

On 10/13/06, Kenneth McDonald <kenneth.m.mcdonald@sbcglobal.net> wrote:
> James Edward Gray II wrote:
> If what you want is a way to easily assemble and use regular
> expressions, I have a Python library that comes in at about 700-800
> lines (excluding unit tests and docs). For example, to define a re
> matching integer complex numbers (uses the fact that Python allows
> named, not just numbered, re groups):
>
>   intPat = OPT("-") + CHAR("0123456789")*1       # *1 means 1 or more.
>   complexPat = intPat['real'] + ALT("-", "+")['op'] + intPat['im']
>
> Let's find out the real parts of all complex numbers in a string:
>
>   for matchresult in complexPat.iter(somestring): print matchresult['real']
>
> Using some of the package's predefined patterns, let's define a complex
> num pattern that handles floating point numbers and whitespace:
>
>   complex = PAT.float['real'] + CHAR.whitespace*0 + ALT("-", "+")['op']
> + PAT.float['im']
>
> etc. etc. I'd like to convert it to Ruby, but don't have the time. It'd
> be a significant but not huge job--more tedious than anything else. I
> suspect the Ruby version would come in a little shorter, maybe 600
> lines? Anyone interested?
>
> Ken