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Q01. What are the main purposes of using regexes?Q02. What are the main Python packages that implement regex functionality?Q03. What are the main R packages that implement regex functionality?Q04. Can you briefly summarize the method used to extract useful information from a free-text note?

Answers

A01. The main purposes of using regexes are:

1. Text validation: Regexes can be used to check if a piece of text matches a certain pattern. This is useful for tasks such as verifying email addresses, dates, or other types of structured data.
2. Text searching and filtering: Regexes can be used to search for patterns in large amounts of text, such as finding all instances of a particular word or phrase in a document. This can also be used to filter out unwanted data, such as removing all instances of a certain word or phrase from a document.
3. Text manipulation and formatting: Regexes can be used to manipulate text in various ways, such as finding and replacing certain words or...