Regex Quiz

What does the regex pattern `^a` match?

• Any string that contains an 'a'

• A string that starts with 'a'

• Any string that ends with 'a'

• None of the above

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DOK Level 1: Recall

Which regex pattern matches any single digit?

• `\d`

• `\D`

• `\w`

• `\s`

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DOK Level 1: Recall

What does the regex pattern `abc?` mean?

• Matches a string 'ab' followed by zero or more 'c'

• Matches a string 'ab' followed by one or more 'c'

• Matches a string 'ab' followed by zero or one 'c'

• Matches exactly the string 'abc'

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DOK Level 1: Recall

In regex, what does the `*` character specify?

• The preceding element must appear exactly once

• The preceding element must not appear at all

• The preceding element can appear zero or more times

• The preceding element can appear one or more times

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DOK Level 1: Recall

Which regex pattern would you use to find sequences of one or more whitespace characters?

• `\s+`

• `\S`

• `\d+`

• `\w+`

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DOK Level 1: Recall

What is the function of the `|` operator in regex?

• Matches either the expression before or the expression after the operator

• Matches the expressions both before and after the operator

• Indicates the start of a capture group

• None of the above

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DOK Level 1: Recall

Which regex pattern matches any character except newline?

• `\.`

• `\n`

• `.`

• `^`

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DOK Level 1: Recall

What does the regex pattern `[a-z]` match?

• Any lowercase letter between 'a' and 'z'

• Any letter between 'a' and 'z'

• The exact string 'a-z'

• None of the above

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DOK Level 1: Recall

In regex, what does the `^` character inside square brackets (e.g., `[^a]`) signify?

• Matches the beginning of the string

• Matches the character 'a' at the beginning of the string

• Does not match the character 'a'

• Matches any character except 'a'

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DOK Level 1: Recall