Question 1

Which of the following String methods can be used to substitute the first instance of a search pattern within a string?

Accepted Answer

A)  sub 
B)  gsub 
C)  rsub 
D)  None of the above 
A)  sub 
B)  gsub 
C)  rsub 
D)  None of the above A

Question 2

The most basic type of regular expression is one that matches up against a specific pattern or a set of characters. This type of pattern can be set up using the {} match operator.

Accepted Answer

A) True 
 B)False  False

Question 3

The \A character is used in a regular expression to look for a match at the beginning of a string.

Accepted Answer

A) True 
 B)False  True

Question 4

Data processed by computer scripts can come from many different sources, including ____.

Accepted Answer

A)  Databases 
B)  Files 
C)  User Input 
D)  All of the above 
A)  Databases 
B)  Files 
C)  User Input 
D)  All of the above

Question 5

The . character is used in a regular expression to look for a match at the beginning of a line.

Accepted Answer

A) True 
 B)False

Question 6

The \D character is used in a regular expression to look for a match with any numeric character.

Accepted Answer

A) True 
 B)False

Question 7

Using regular expressions you can define patterns that ____.

Accepted Answer

A)  Perform search and replace operations on strings 
B)  Keep counts of instances of patterns 
C)  Extract a substring from a larger string 
D)  All of the above 
A)  Perform search and replace operations on strings 
B)  Keep counts of instances of patterns 
C)  Extract a substring from a larger string 
D)  All of the above

Question 8

The ____ metacharacter modifier is used to search a string for one or more instances of a character.

Accepted Answer

A)  + 
B)  = 
C)  * 
D)  (?) 
A)  + 
B)  = 
C)  * 
D)  (?)

Question 9

Which of the character classes can be used to match a number between 0 and 9?

Accepted Answer

A)  /[numeric]/ 
B)  /[a - x , 0 - 9]/ 
C)  /[0-9]/ 
D)  All of the above 
A)  /[numeric]/ 
B)  /[a - x , 0 - 9]/ 
C)  /[0-9]/ 
D)  All of the above

Question 10

Which of the following is true about regular expressions?

Accepted Answer

A)  In most cases, regular expression patterns are processed from right to left. 
B)  Matches occur when patterns are found anywhere within a source string. 
C)  By default, matches are case insensitive. 
D)  Every character inside a pattern is taken literally, including metacharacters. 
A)  In most cases, regular expression patterns are processed from right to left. 
B)  Matches occur when patterns are found anywhere within a source string. 
C)  By default, matches are case insensitive. 
D)  Every character inside a pattern is taken literally, including metacharacters.

Question 11

Which of the following statements is true in regard to the following example? if "Welcome the USA!." =~ /USA|America/ then puts "We have a match!" end

Accepted Answer

A)  A pattern search has been set up to search the source string for either the words USA or America. A match occurs if either string is found. 
B)  A pattern search has been set up to search the source string for both the words USA and America. A match occurs only if both strings are found. 
C)  A case-insensitive search has been set up that searches the source string for either the words USA or America. A match occurs is either string is found. 
D)  None of the above. 
A)  A pattern search has been set up to search the source string for either the words USA or America. A match occurs if either string is found. 
B)  A pattern search has been set up to search the source string for both the words USA and America. A match occurs only if both strings are found. 
C)  A case-insensitive search has been set up that searches the source string for either the words USA or America. A match occurs is either string is found. 
D)  None of the above.

Question 12

The =~ operator is the "not equals to" operator in a regular expression.

Accepted Answer

A) True 
 B)False

Question 13

Which of the following operators should be used in a regular expression to determine equality?

Accepted Answer

A)  !~ 
B)  = 
C)  + 
D)  None of the above 
A)  !~ 
B)  = 
C)  + 
D)  None of the above

Question 14

Which of the following regular expression metacharacters looks for a match at the beginning of a line?

Accepted Answer

A)  . 
B)  ^ 
C)  $ 
D)  \w 
A)  . 
B)  ^ 
C)  $ 
D)  \w

Question 15

Which of the following regular expression metacharacters matches any non-alphabetic, non-numeric, or non-underscore character?

Accepted Answer

A)  \S 
B)  \D 
C)  \W 
D)  \Z 
A)  \S 
B)  \D 
C)  \W 
D)  \Z

Question 16

You can validate data using regular expressions. However, to truly create powerful validation routines, you should instead rely on conditional logic and methods belonging to Ruby classes.

Accepted Answer

A) True 
 B)False

Question 17

Which of the following regular expression metacharacters looks for a match at the end of a line?

Accepted Answer

A)  . 
B)  $ 
C)  \W 
D)  \w 
A)  . 
B)  $ 
C)  \W 
D)  \w

Question 18

Character classes are used to search for a range of characters and are defined by placing a list of characters within ____ characters.

Accepted Answer

A)  { } 
B)  ( ) 
C)  # # 
D)  [ ] 
A)  { } 
B)  ( ) 
C)  # # 
D)  [ ]

Question 19

Using regular expressions, you can pick apart and process the contents of data regardless of its source, including text files and databases.

Accepted Answer

A) True 
 B)False

Question 20

Using regular expressions, you can perform detailed analysis of user input to determine if it meets specific criteria.

Accepted Answer

A) True 
 B)False

Which of the following String methods can be used to substitute the first instance of a search pattern within a string?

The most basic type of regular expression is one that matches up against a specific pattern or a set of characters. This type of pattern can be set up using the {} match operator.

The \A character is used in a regular expression to look for a match at the beginning of a string.

Data processed by computer scripts can come from many different sources, including ____.

The . character is used in a regular expression to look for a match at the beginning of a line.

The \D character is used in a regular expression to look for a match with any numeric character.

Using regular expressions you can define patterns that ____.

The ____ metacharacter modifier is used to search a string for one or more instances of a character.

Which of the character classes can be used to match a number between 0 and 9?

Which of the following is true about regular expressions?

Which of the following statements is true in regard to the following example? if "Welcome the USA!." =~ /USA|America/ then puts "We have a match!" end

The =~ operator is the "not equals to" operator in a regular expression.

Which of the following operators should be used in a regular expression to determine equality?

Which of the following regular expression metacharacters looks for a match at the beginning of a line?

Which of the following regular expression metacharacters matches any non-alphabetic, non-numeric, or non-underscore character?

You can validate data using regular expressions. However, to truly create powerful validation routines, you should instead rely on conditional logic and methods belonging to Ruby classes.

Which of the following regular expression metacharacters looks for a match at the end of a line?

Character classes are used to search for a range of characters and are defined by placing a list of characters within ____ characters.

Using regular expressions, you can pick apart and process the contents of data regardless of its source, including text files and databases.

Using regular expressions, you can perform detailed analysis of user input to determine if it meets specific criteria.

Ruby Basics

Interacting With Ruby

Working With Strings, Objects, and Variables

Implementing Conditional Logic

Working With Loops

Working With Collections of Data

Object-Oriented Programming

File and Folder Administration

Debugging

Ruby on Rails Web Development

Filters

Exam 7: Working With Regular Expressions

Which of the following String methods can be used to substitute the first instance of a search pattern within a string?

The most basic type of regular expression is one that matches up against a specific pattern or a set of characters. This type of pattern can be set up using the {} match operator.

The \A character is used in a regular expression to look for a match at the beginning of a string.

Data processed by computer scripts can come from many different sources, including ____.

The . character is used in a regular expression to look for a match at the beginning of a line.

The \D character is used in a regular expression to look for a match with any numeric character.

Using regular expressions you can define patterns that ____.

The ____ metacharacter modifier is used to search a string for one or more instances of a character.

Which of the character classes can be used to match a number between 0 and 9?

Which of the following is true about regular expressions?

Which of the following statements is true in regard to the following example? if "Welcome the USA!." =~ /USA|America/ then puts "We have a match!" end

The =~ operator is the "not equals to" operator in a regular expression.

Which of the following operators should be used in a regular expression to determine equality?

Which of the following regular expression metacharacters looks for a match at the beginning of a line?

Which of the following regular expression metacharacters matches any non-alphabetic, non-numeric, or non-underscore character?

You can validate data using regular expressions. However, to truly create powerful validation routines, you should instead rely on conditional logic and methods belonging to Ruby classes.

Which of the following regular expression metacharacters looks for a match at the end of a line?

Character classes are used to search for a range of characters and are defined by placing a list of characters within ____ characters.

Using regular expressions, you can pick apart and process the contents of data regardless of its source, including text files and databases.

Using regular expressions, you can perform detailed analysis of user input to determine if it meets specific criteria.

Ruby Basics

Interacting With Ruby

Working With Strings, Objects, and Variables

Implementing Conditional Logic

Working With Loops

Working With Collections of Data

Object-Oriented Programming

File and Folder Administration

Debugging

Ruby on Rails Web Development

Filters