Core Java Programming Course- Bracket Expressions in RegEx (regular expressions)

The video tutorial explains the concept of bracket expressions in regular expressions, focusing on how square brackets can be used to specify a set of characters or a range of characters. It covers the use of literals, ranges, and the carrot sign for negation. The tutorial also discusses how to include special characters and apply quantifiers to bracket expressions, providing examples to illustrate these concepts.

What is the primary function of square brackets in regular expressions?

• To indicate a comment in the pattern

• To denote the start of a string

• To group characters as a single unit

• To specify a set of characters to match

How do square brackets differ from small brackets in regular expressions?

• Square brackets match any character from a set, while small brackets group characters

• Square brackets are used for comments, while small brackets are for matching

• Square brackets are used for quantifiers, while small brackets are not

• Square brackets denote the start of a string, while small brackets denote the end

Which of the following can be included inside square brackets to match a pattern?

• Only lowercase letters

• Only uppercase letters

• Only numbers

• Any character, including digits and special characters

What does a range like A-Z inside square brackets signify?

• It matches any uppercase letter

• It matches any special character

• It matches any digit

• It matches any lowercase letter

How can you specify a custom range in square brackets?

• By using a caret (^) symbol

• By using a comma (,) between characters

• By listing each character individually

• By using a hyphen (-) between the start and end characters

What effect does the caret (^) symbol have when placed at the beginning of a square bracket expression?

• It matches only digits

• It negates the set, matching anything not in the brackets

• It acts as a wildcard for any character

• It matches only uppercase letters

How can quantifiers be used with square brackets in regular expressions?

• They are used to comment out parts of the pattern

• They indicate the start of a new pattern

• They specify the exact number of times the pattern should repeat

• They cannot be used with square brackets