Regular expression (Quiz 1)

What does the regular expression ^abc match?

• Any string containing "abc"

• A string ending with "abc"

• A string starting with "abc"

• A string with only "abc"

What does the . (dot) symbol match in a regular expression?

• A digit

• A space

• Any single character except newline

• The end of a string

What will the regex a* match?

• Zero or more 'a' characters

• One or more 'a' characters

• Exactly one 'a'

• No match at all

What does the \d represent in regex?

• Any digit

• A lowercase 'd'

• A whitespace

• A word character

Which regex matches exactly a 5-digit number?

• \d+

• \d{5}

• \d*

• \d{1,5}

Which regex will match email addresses like [e-mail]?

• [a-z]+@[a-z]+\.[a-z]+

• \w+@\w+\.\w+

• \S+@\S+

• .+@.+

What does the + symbol mean in regex?

• Optional

• Zero or more

• One or more

• Exactly one

What does [^0-9] match?

• Only digits

• Only non-digit characters

• Only the caret symbol

• Only numbers between 0 and 9

Which regex matches strings ending with "end"?

• ^end

• end$

• end\*

• .*end.*

Which of the following matches any alphanumeric character and underscore?

• \s

• \d

• \w

• .