From: Axel Etzold <AEtzold@...>
Date: 2007-06-17T03:40:46+09:00
Subject: Re: Negative lookahead in Regexp question

Dear Byron,

thank you for responding.
I am working on an analysis of so-called chunked text,
i.e., an analysis of words in a sentence, that 
classifies words as nouns / verbs / adjectives etc.

A typical sentence with chunking tags thus looks like this: 

"<NC> The physical descriptions </NC> <PC> of <NC> places </NC> <PC> in <NC> North Carolina </NC> </PC> , <PC> in </PC> <ADV> so far </ADV> as <NC> they </NC> <VC> are </VC> <NC> specific </NC> <PC> at <NC> all </NC> </PC> , <VC> owe </VC> <NC> a little </NC> <PC> to <NC> memories </NC> </PC> <PC> of <NC> my childhood </NC>, although <NC> I </NC> <VC> 've also borrowed </VC> <ADV> indiscriminately </ADV> <PC> from <NC> other people 's childhood memories </NC> </PC> <PC> as </PC> <ADV> well </ADV> ."

Originally, I wanted to use Regexps to split the original sentence
into groups using negative lookahead, which I've now skipped in favor
of repeated Array.splits, but I think I could you use knowing how to
search for a substring using negative lookahead, i.e., as in my example:

regexp=/.../  <= searched for, such that:
string="<NC> In North Carolina </NC>"
ref=regexp.match(string)
p ref[1]  => "In North Carolina" 

Thank you for any help!

Best regards,

Axel 
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