Corpora: Regular expressions question

Ken Litkowski (ken@clres.com)
Fri, 02 Apr 1999 13:32:31 -0500

I am using regular expressions to recognize defining patterns in
annotated parse trees and I would like to be clear in characterizing
it. I am using the notation "oneof" (select from a list), rep01 (0 or 1
time), rep0n (0 to n times), and rep1n (1 to n times), and can include
literals, parts of speech, annotations on the parse tree, and
selectional restriction specifications in writing a defining pattern. I
will start from the lowest level and ask the question whether each is
still just a regular expression:

1. Combination of literals:
"a manner"
2. Addition of parts of speech:
"det rep0n(adj) manner"
3. Addition of annotations:
"adj(pres-p) noun" (pres-p == present participle)
4. Addition of selectional restrictions:
"det rep0n(adj) noun(+state)" (a noun defined as a state)

Thanks for any assistance.

Ken

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Ken Litkowski                     TEL.: 301-482-0237
CL Research                       EMAIL: ken@clres.com
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