How would a parsers know the difference between punctuations in a url or handle vs those at the end of sentences

[Sriram_Kollipara]

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• Context of the question - In the preprocessing step here - https://www.coursera.org/learn/classification-vector-spaces-in-nlp/lecture/nbPdT/preprocessing

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In the above sentence how would a program decide to remove ! at the end, but not @, :, \, or . in stop words and punctuation phase.

[Nevermnd]

@Sriram_Kollipara for a given set of characters you can add a positive look ahead assertion: (?=\s|$) to your REGEX.

Think of an assertion as a restriction. ‘?=’ implements the assertion ‘\s’ is a whitespace, the pipe ‘|’ stands for or, and ‘$’ is end of sentence.