08 Regular Expressions

Question 1

Also known as regex, it is a character or a sequence of characters that represent a string or multiple strings.

Answer 1

Regular expression

Question 2

What is the package used for regular expressions?

Answer 2

java.util.regex;

Question 3

What is the method that returns true if a string matches the given regular expression?

Answer 3

matches(String regex)

Question 4

It is the wildcard operator that represents any single character in regular expressions.

Answer 4

dot (.)

Question 5

It is any symbol in regular expressions that indicates the number of times a specified character appears in a matching string.

Answer 5

Repetition Operator

Question 6

What are the repetition operators?

Answer 6

*
?
+
{x}
{x,y}
{x,}

Question 7

Repetition operator when there is 0 or more occurrences.

Answer 7

*

Question 8

Repetition operator when there is 0 or 1 occurrence.

Answer 8

?

Question 9

Repetition operator when there is 1 or more occurrence.

Answer 9

+

Question 10

Repetition operator when there is an x number of occurences.

Answer 10

{x}

Question 11

Repetition operator when there is a number between x & y occurrences.

Answer 11

{x,y}

Question 12

Repetition operator when there is a number of x or more occurrences.

Answer 12

{x,}

Question 13

Class that stores the format of a regular expression.

Answer 13

Pattern class

Question 14

A method that compiles the give regular expression into a pattern.

Answer 14

compile()

Question 15

Class that stores a possible match between a pattern and a string.

Answer 15

Matcher class

Question 16

Method that scans the input sequence looking for the next subsequence that matches the pattern.

Answer 16

find()

Question 17

Method that splits the string around matches of the given regular expression.

Answer 17

split()

Question 18

Method that is used to replace all the occurrences of the defined regular expression found in the string with another string.

Answer 18

replaceAll()