Regular Expressions [Part 2] - Metacharacter Symbols

This video tutorial covers the basics of regular expressions, including the use of literal characters, metacharacter symbols, wildcards, and optional characters. It also explains how to create a custom function to test regular expressions and handle case sensitivity. The tutorial further explores the use of the dot (.) and asterisk (*) as wildcards, the question mark (?) for optional characters, and how to escape characters to use them as literals. The video concludes with a brief introduction to character sets, quantifiers, and grouping, which will be covered in the next lecture.

What is the purpose of the custom function created in the video?

• To evaluate mathematical expressions

• To sort an array of strings

• To log whether a string matches a regular expression

• To convert strings to uppercase

Why did the string 'Hello World' not match the expression 'hello' initially?

• Because of case sensitivity

• Because the string contained numbers

• Because the expression was not defined

• Because the string was too long

What does the caret (^) symbol signify in regular expressions?

• It matches any character

• It indicates the start of a string

• It matches the end of a string

• It makes the expression case insensitive

What does the dollar sign ($) symbol indicate in a regular expression?

• The start of a string

• A wildcard character

• The end of a string

• An optional character

What is the role of the dot (.) in regular expressions?

• It matches any single character

• It matches the start of a string

• It matches the end of a string

• It makes the expression case insensitive

How does the asterisk (*) function in regular expressions?

• It matches the end of a string

• It matches zero or more occurrences of the preceding character

• It matches the start of a string

• It matches exactly one character

What does the question mark (?) signify in a regular expression?

• It matches the end of a string

• It indicates an optional character

• It matches any single character

• It matches the start of a string

How can you make a character literal in a regular expression?

• By placing it in square brackets []

• By escaping it with a backslash (\)

• By using a dollar sign ($) after it

• By using a caret (^) before it

What happens if you do not escape a special character in a regular expression?

• It is treated as a literal character

• It is ignored

• It is treated as a special character

• It causes an error

Which of the following is true about the use of the question mark (?) in regular expressions?

• It matches the start of a string

• It makes the preceding character optional

• It matches the end of a string

• It matches any single character