Quantifiers

Question 0

*

Answer 0

Match 0 or more times. Example: ab* matches a, ab, abb, abbb etc.

Question 1

?

Answer 1

Match 0 or 1 times. Example: ab? matches a and ab

Question 2

+

Answer 2

Match 1 or more times. Example: ab+ matches ab, abb, abbb etc.

Question 3

{n}

Answer 3

Match exactly n times. Example: ab{2} matches abb

Question 4

{n,}

Answer 4

Match n or more times. Example: ab{2,} matches abb, abbb, abbbb etc.

Question 5

{n,m}

Answer 5

Match at least n times, but no more than m times. Example: ab{2,3} matches abb and abbb

Question 6

??

Answer 6

Match 0 or 1 times, but as few times as possible. Example: ab?? against abbbbb matches a

Question 7

*?

Answer 7

Match 0 or more times, but as few times as possible. Example: ab*? against abbbbb matches a

Question 8

+?

Answer 8

Match 1 or more times, but as few times as possible. Example: ab+? against abbbbb matches ab

Question 9

{n}?

Answer 9

Match n or more times, but as few times as possible. Example: ab{2}? against abbbbb matches abb

Question 10

{n,m}?

Answer 10

Match at least n times, no more than m times, but as few times as possible. Example: ab{2,3}? against abbbbb matches abb