Core Java Programming Course- RegEx (regular expressions) Exercise 1

The video tutorial explains how to create a regular expression (regex) pattern to represent multiple website domains. It covers the construction of a regex pattern using common and varying parts of URLs, testing the pattern with different strings, and understanding the role of the dot character in regex. The tutorial also discusses the importance of using escape characters to treat dots as literal characters in regex patterns.

What is the purpose of using a pipe symbol in a regular expression pattern?

• To match any single character

• To indicate a choice between alternatives

• To separate different parts of a URL

• To escape special characters

Which part of the website pattern is considered static in the given example?

• The top-level domain

• The company name

• The domain name

• The 'www' prefix

What issue arises when using a dot in a regular expression without escaping it?

• It matches only literal dots

• It matches any single character

• It matches only numbers

• It causes a syntax error

How can you ensure a dot is treated as a literal character in a regular expression?

• By using a double dot

• By placing it in square brackets

• By using a pipe symbol

• By using a backslash to escape it

What is the result of running a regex pattern without escaping the dot when testing a URL?

• It will cause an error in the program

• It will match any character in place of the dot

• It will only match URLs with literal dots

• It will not match any URLs