[CWB] Regular expressions with word groups

Tue Jul 28 22:01:21 CEST 2020

Practically speaking, probably the easiest way to do what you want is to do a diff between a query that contains (wanted+unwanted) and a query that contains just (unwanted).

best

Andrew.

From: cwb-bounces at sslmit.unibo.it <cwb-bounces at sslmit.unibo.it> On Behalf Of Josep M. Fontana
Sent: 28 July 2020 20:23
To: cwb at sslmit.unibo.it
Subject: Re: [CWB] Regular expressions with word groups

Hi Andrés,

Yes, you understand correctly. In this search that I gave as an example:

[(word="f[ei]rid.*")|(word="muert[ao].*")] !(([(pos="S.*") & (word="d.*")][word=".*el"][word="ca[buv]allo.*"])|[word="entierra"]|([word="en"][word="tierra"]))

I want an expression matching any of the patterns within the first pair of square brackers '[ ]' followed by any words or word groups that are NOT either "del cauallo" (or any of its variations), "entierra" or "en tierra".

If I place the ! before the parenthesis enclosing the rest of word groups, I still get "muerto en tierra". If I place it before the parenthesis including the word group "en tierra" (like this ➝ !([word="en"][word="tierra"])  I still get "muerto en tierra".

I assume the example that appears in the manual (i.e. [(lemma="go") & !(word="went"%c | word="gone"%c)]; ) works but I'm wondering whether the '!' operator only works when it appears within a group enclosed in '[ ]'.

The kind of regular expression I'm using cannot be all included within '[ ]'. When I don't use the ! operator it works perfectly and I get "muerto en tierra", "muerto entierra", "muerto del cavallo", etc. Why can't I negate the whole thing by placing a single ! somewhere? I've tried placing the ! after the first parenthesis and it doesn't work either.

JM

Maybe I'm wrong, but I understand that you want nothing from the ! on....

check this regex from the manual:

[(lemma="go") & !(word="went"%c | word="gone"%c)];

I hope it is what you're looking for, if so, it is just a thing of notation....

El Mar, 28 de Julio de 2020, 19:56, Josep M. Fontana escribió:

Thanks Andrews and/or Andreses for your quick responses,

I have had problems with both of our suggestions. In principle I would like to use a single ! operator for the whole regular expression pattern rather than having to add it to every relevant subpattern.

But wherever I place the '!' i don't seem to get the desired results. So, if I do the following:

[(word="f[ei]rid.*")|(word="muert[ao].*")] !(([(pos="S.*") & (word="d.*")][word=".*el"][word="ca[buv]allo.*"])|[word="entierra"]|([word="en"][word="tierra"]))

one of the first hits I get is:

 cayo  muerto  en tierra

This should be out because the last of the word groups that I have is ([word="en"][word="tierra"]). Shouldn't the ! operator have scope over the last group as well?

Josep M.

Hey Josep,

I'm fairly sure you just use ! if you're not testing a specific annotation. Place ! before the left parenthesis of the group you're trying to test. So if you're trying to test the negation of that entire group, just add ! to the front of it. See 2.6 in the CQP Tutorial.

All the best,

Andrew

On Tue, Jul 28, 2020 at 11:15 AM Josep M. Fontana josepm.fontana at upf.edu<mailto:josepm.fontana at upf.edu>> wrote:
Hi,

I don't know whether this is the right forum to ask this particular kind
of question but I figure there are enough people here with sufficient
experience to lend me a hand with this problem. If you cannot answer the
question but you can point me to some other forum/group where I can find
help, I would appreciate it.

So, I have the following regular expression to identify a set of
expressions that can appear in a particular position in the text. What I
would like to do is to create the negation of this regular expression.
That is, any string/expression/group of expressions that does NOT
contain the expressions in these groups.

I know how to use the != operator for a particular item (word, pos,
lemma) but where would one insert this operator to have scope over the
whole group of expressions that match this pattern? Thanks in advance.

(([(pos="S.*") &
(word="d.*")][word=".*el"][word="ca[buv]allo.*"])|[word="entierra"]|([word="en"][word="tierra"]))

Josep M.

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