From: Dick Ulrich

Regarding message:
http://www.escribe.com/internet/rebol/m25365.html

> >> print Embed "Hello$(a)"
> ** Script Error: Alpha has no value
> ** Where: Embed
> ** Near: parse String: copy String Rule:
> >> print Embed "Hello $(a) "
>
> Wish I knew how to debug this to see what is happening.

Hi, Dick,

I must say that Andrew's example is fairly advanced, and he warns that the
recursive feature is not quite right yet.  But the problem that you have run
into is that he apparently forgot to supply you the some rule definitions.
These may work:

digit: charset [#"0" - #"9"]
alpha: charset [#"A" - #"Z" #"a" - #"z"]
alphadigit: union alpha digit

I was going to under take to explain his example more fully, and then I
realized that I wasn;t quite sure what he was intending in a few spots.
Depending on your ultimate needs, there may be an easier way to accomplish
the task.  (We all suffer the paradigm shift problem of "I know how to do
blah, blah in this or that language, but how do I do it in REBOL?")

Andrew is a New Zealander, so he should be awake later in our day (central
time zone) and will likely help.
--Scott Jones

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