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  3. Regular Expressions in Python
  • 1

    Basic Concepts of String Manipulation

    Free

    Start your journey into the regular expression world! From slicing and concatenating, adjusting the case, removing spaces, to finding and replacing strings. You will learn how to master basic operation for string manipulation using a movie review dataset.

  • 2

    Formatting Strings

    Following your journey, you will learn the main approaches that can be used to format or interpolate strings in python using a dataset containing information scraped from the web. You will explore the advantages and disadvantages of using positional formatting, embedding expressing inside string constants, and using the Template class.

  • 3

    Regular Expressions for Pattern Matching

    Time to discover the fundamental concepts of regular expressions! In this key chapter, you will learn to understand the basic concepts of regular expression syntax. Using a real dataset with tweets meant for sentiment analysis, you will learn how to apply pattern matching using normal and special characters, and greedy and lazy quantifiers.

  • 4

    Advanced Regular Expression Concepts

    In the last step of your journey, you will learn more complex methods of pattern matching using parentheses to group strings together or to match the same text as matched previously. Also, you will get an idea of how you can look around expressions.

Initializing

Exercise

Ugh! Not for me!

After finding positive tweets, you want to do it for negative tweets. Your plan now is to find sentences that contain the words hate, dislike or disapprove. You will again save the movie or concert name. You will get the tweet containing the words movie or concert but this time, you don't plan to save the word.

For example, if you have the sentence: I dislike the movie Avengers a lot.. You match and capture dislike. You will match but not capture the word movie. Afterwards, you match and capture anything until the dot.

The list sentiment_analysis containing the text of three tweets as well as the re module are loaded in your session. You can use print() to view the data in the IPython Shell.

Instructions

100 XP
  • Complete the regular expression to capture the words hate or dislike or disapprove. Match but don't capture the words movie or concert. Match and capture anything appearing until the ..
  • Find all matches of the regex in each element of sentiment_analysis. Assign them to negative_matches.
  • Complete the .format() method to print out the results contained in negative_matches for each element in sentiment_analysis.