problem using nltk.RegexpTagger

[Yosr Eman]

hello,

i'm using nltk.RegexpTagger(patterns), and wrote my patterns as follow

#========================================================

patterns = [

#=========================adjectives=====================

(r'.*ful$', 'JJ'),

(r'.*ious$', 'JJ'),

(r'.*ble$', 'JJ'),

(r'.*ic$', 'JJ'),

(r'.*ive$', 'JJ'),

(r'.*ic$', 'JJ'),

(r'.*est$', 'JJ'),

#=========================article====================

.... some other patterns

#===========================Noun==========================

(r'.*\'s$', 'NN$'),               # possessive nouns

(r'.*s$', 'NNS'),                 # plural nouns

(r'.*ation$', 'NN'),

(r'.*ism$', 'NN'),  #capitalism

(r'.*ment$', 'NN'), #assignment

(r'.*ness$', 'NN'), #sadness

(r'.*ance$', 'NN'), #acceptance

(r'.*ful$', 'NN'), #greatful

#==========================================================

(r'^-?[0-9]+(.[0-9]+)?$', 'CD'),  # cardinal numbers

(r'.*', 'NN')                     # nouns (default)

]

it works good, but my problem is setting pattern according to the previous word, for example: if the previous word is "AT" the next word will be "NN", could you please help me in this?

thanks for your time

[Alexis Dimitriadis]

Hi Yosr,

The regexp tagger only looks at the word itself. To take the previous word into account, you need one of the other taggers, e.g. the bigram tagger. You can chain together a bigram tagger and a regexp tagger (and more). See chapter 5 of the NLTK book. (You can also train them automatically instead of writing the rules by hand.)

Alexis

Dr. Alexis Dimitriadis | Assistant Professor and Senior Research Fellow | Utrecht Institute of Linguistics OTS | Utrecht University | Trans 10, 3512 JK Utrecht, room 2.33 | +31 30 253 65 68 | a.dimi...@uu.nl | www.hum.uu.nl/medewerkers/a.dimitriadis

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[Yosr Eman]

Thx Alexis