Regular Expression Operators

Question 1

Operator:

.

Answer 1

Matches any single character.

Question 2

Operator:

?

Answer 2

The preceding item is optional and will be matched, at most, once.

Question 3

Operator:

*

Answer 3

The preceding item will be matched zero or more times.

Question 4

Operator:

+

Answer 4

The preceding item will be matched one or more times.

Question 5

Operator:

{N}

Answer 5

The preceding item is matched exactly N times.

Question 6

Operator:

{N, }

Answer 6

The preceding item is matched N or more times.

Question 7

Operator:

{N, M}

Answer 7

The preceding item is matched at least N times, but not more than M times.

Question 8

Operator:

-

Answer 8

represents the range if it’s not first or last in a list or the ending point of a range in a list.

Question 9

Operator:

Answer 9

Matches the empty string at the beginning of a line; also represents the characters not in the range of a list.

Question 10

Operator:

$

Answer 10

Matches the empty string at the end of a line.

Question 11

Operator:

\b

Answer 11

Matches the empty string at the edge of a word.

Question 12

Operator:

\B

Answer 12

Matches the empty string provided it’s not at the edge of a word.

Question 13

Operator:

\<

Answer 13

Match the empty string at the beginning of word.

Question 14

Operator:

\>

Answer 14

Match the empty string at the end of word.