Core Java Programming Course- RegEx (regular expressions) Exercise 2

The video tutorial explains how to regularize and extract prices from a string using regex. It covers the construction of a regex pattern that can match various price formats, including those with digits before and after the decimal point. The tutorial also discusses the significance of regex components like the dot and dollar sign, and how to escape their default meanings. Finally, it demonstrates the implementation of the pattern to extract prices and tests it with different price formats.

What is the primary goal of regularizing prices in a string?

• To calculate the total cost of items

• To ensure prices are formatted consistently for extraction

• To convert all prices to a single currency

• To apply discounts to prices

Which character is used to denote the start of a price in the regular expression pattern?

• The ampersand symbol (&)

• The dollar sign ($)

• The percentage symbol (%)

• The hash symbol (#)

In regular expressions, what does the dot (.) character typically represent?

• The end of a string

• Any single character

• A literal dot

• A space character

Why is it important to escape special characters in regular expressions?

• To increase the speed of pattern matching

• To ensure they are treated as literal characters

• To make the pattern more readable

• To allow the use of multiple patterns simultaneously

What is the purpose of using a matcher in the context of regular expressions?

• To compile the regular expression pattern

• To replace matched patterns with new values

• To split a string into multiple parts

• To find and retrieve matches from a string

How can you test if a regular expression pattern correctly matches prices?

• By running the pattern on a string with various price formats

• By manually comparing the pattern to a list of prices

• By checking the pattern against a dictionary of prices

• By using the pattern in a financial application

Which companies are known to ask questions about regular expressions in interviews?

• Netflix, Hulu, Disney

• Amazon, Facebook, Google

• Tesla, SpaceX, Blue Origin

• Microsoft, Apple, IBM