CODEWITHSUNDEEP
pythonregexpython-2.7text-segmentation
ChuNan
ChuNan

Reputation: 1151

segment paragraph to sentences

I'm trying to segment a paragraph to sentences. I selected '.', '?' and '!' as the segmentation symbols. I tried:

format = r'((! )|(. )|(? ))'
delimiter = re.compile(format)
s = delimiter.split(line)

but it gives me sre_constants.error: unexpected end of pattern

I also tried

format = [r'(! )',r'(? )',r'(. )']
delimiter = re.compile(r'|'.join(format))

it also causes error.

What's wrong with my method?

Upvotes: 2

Views: 703

Answers (1)

Robin
Robin

Reputation: 9644

. (wildcard) and ? (zero or one, quantifier) are special regex characters, you need to escape them to use them literally.

However, in your case it would be much simpler to use a character class (inside which these characters aren't special anymore):

split(r'[!.?] ')

A character class [...] stands for "one character, any of the ones included inside the character class".

Upvotes: 6

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