How to extract some words pattern from string using regex in python

Question

I want to extract words from a string that contain specific character (/IN) until to other specific character (/NNP). My code so far (still not work):

import re

sentence = "Entah/RB kenapa/NN ini/DT bayik/NN suka/VBI banget/JJ :/: )/CP :/: )/CP :/: )/CP berenang/VBI di/IN Jln/NN Terusan/NNP Borobudur/NNP dan/NN di/IN Jalan/NN Perempatan/ADJ Malioboro/NNP"

tes = re.findall(r'((?:\S+/IN\s\w+/NNP\s*)+)', sentence)
print(tes)

So the sentence contain words di/IN Jln/NN Terusan/NNP Borobudur/NNP and di/IN Jalan/NN Perempatan/ADJ Malioboro/NNP that I like to extract. The expected result:

['di/IN Jln/NN Terusan/NNP Borobudur/NNP', 'di/IN Jalan/NN Perempatan/ADJ Malioboro/NNP']

What is the best way to do this task? thanks.

Wiktor Stribiżew · Accepted Answer · 2017-04-13 06:34:01Z

2

Use

r'\S+/IN\b(?:(?!\S+/IN\b).)+\S+/NNP\b'

See the regex demo

Details

\S+ - 1+ non-whitespace symbols
/IN\b - a /IN substring as a whole word
(?:(?!\S+/IN\b).)+ - any 1+ chars other than line break chars that do not match the \S+/IN\b pattern sequence (use re.DOTALL to match line breaks, too)
\S+/NNP\b - 1+ non-whitespaces, /NNP as a whole word (since \b is a word boundary)

edited Apr 13, 2017 at 6:34

answered Apr 13, 2017 at 6:24

Wiktor Stribiżew

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14 Comments

Kasravnd Over a year ago

Try :

sentence = "Entah/RB kenapa/NN ini/DT bayik/NN suka/VBI banget/JJ :/: )/CP :/: )/CP :/: )/CP berenang/VBI di/IN Jln/NN Terusan/NNP Borobudur d/NN /NNP dan/NN di/IN Jalan/NN Perempatan/ADJ Malioboro/NNP"

added d/NN between the first two NNP.

Kasravnd Over a year ago

Still doesn't work. Beside that case it also doesn't cover the case that there is no string between /IN and /NNp.

Wiktor Stribiżew Over a year ago

@Kasramvd: There must be something between them, there will be at least a space, thus the + quantifier is correct.

Kasravnd Over a year ago

I mean with space. It doesn't match that case. Test with

sentence = "Entah/RB kenapa/NN ini/DT bayik/NN suka/VBI banget/JJ :/: )/CP :/: )/CP :/: )/CP berenang/VBI di/IN Jln/NN Terusan/NNP Borobudur d/IN /NNP dan/NN di/IN Jalan/NN Perempatan/ADJ Malioboro/NNP"

Wiktor Stribiżew Over a year ago

Can a token be empty and classified as a noun? That is weird, but [^\s/]*/IN\b(?:(?![^\s/]*/IN\b).)+[^\s/]*/NNP\b would cover that.

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