RegEx

Question 1

Alternation definition

Answer 1

Chooses one alternative or the other

Question 2

Bell (alarm) definition

Answer 2

Device control code sent to ring a small bell

Question 3

Carriage return definition

Answer 3

Returns the position of the cursor to the first position on the same line

Question 4

Vertical tab definition

Answer 4

A tab function that moves the cursor up or down 6 spaces

Question 5

Form feed definition

Answer 5

Forces the printer to eject the current page and continue printing at the top of another

Question 6

ASCII definition

Answer 6

Character encoding standard for electronic communication

Question 7

ASCII pronunciation

Answer 7

/‘æski:/

Question 8

Octal definition

Answer 8

A base-8 number system using 0 to 7

Question 9

ASCII octal number of digits

Answer 9

Up to 3

Question 10

Hexadecimal definition

Answer 10

Positional system using base of 16

Question 11

ASCII hexadecimal number of digits

Answer 11

2

Question 12

Unicode hexadecimal number of digits

Answer 12

4

Question 13

Control character

Answer 13

A character such as control-C

Question 14

Word character definition

Answer 14

a-z, A-Z, 0-9, _

Question 15

Whitespace character

Answer 15

space, tab, newline

Question 16

Decimal digit definition

Answer 16

0-9

Question 17

Start of a string metacharacter

Question 18

Start of a string example

Answer 18

^abc

abc, abcdefg, abc123

Question 19

End of a string metacharacter

Answer 19

$

Question 20

End of a string example

Answer 20

abc$

abc, endsinabc, 123abc

Question 21

Any character (except \n)

Answer 21

.

Question 22

Any character except \n example

Answer 22

a.c

abc, aac, acc, adc, aec

Question 23

Alternation metacharacter

Answer 23

|

Question 24

Alternation example

Answer 24

bill|ted

ted, bill

Question 25

Explicit quantifier metacharacter

Answer 25

{...}

Question 26

Explicit quantifier example

Answer 26

ab{2}c | abbc

Question 27

Explicit set of characters to match metacharacters

Answer 27

[...]

Question 28

Explicit set of characters to match example

Answer 28

a[bB]c | abc, aBc

Question 29

Logical grouping of part of an expression metacharacters

Answer 29

(...)

Question 30

Logical grouping of part of an expression example

Answer 30

(abc){2} | abcabc

Question 31

0 or more of previous expression metacharacter

Answer 31

*

Question 32

0 or more of previous expression example

Answer 32

ab*c | ac, abc, abbc, abbbc

Question 33

1 or more of previous expression metacharacter

Answer 33

+

Question 34

1 or more of previous expression example

Answer 34

ab+c | abc, abbc, abbbc

Question 35

0 or 1 of previous expression metacharacter

Answer 35

?

Question 36

0 or 1 of previous expression example

Answer 36

ab?c | ac, abc

Question 37

Escape metacharacter

Answer 37

\

Question 38

Escape example

Answer 38

a\.c | a.c

Question 39

Bell (alarm) character escape

Answer 39

\a

Question 40

Backspace (if in []) or word boundary character escape

Answer 40

\b

Question 41

Tab character escape

Answer 41

\t

Question 42

Carriage return character escape

Answer 42

\r

Question 43

Vertical tab character escape

Answer 43

\v

Question 44

Form feed character escape

Answer 44

\f

Question 45

New line character escape

Answer 45

\n

Question 46

Escape character escape

Answer 46

\e

Question 47

ASCII octal character escape example

Answer 47

\040

Question 48

ASCII hexadecimal character escape example

Answer 48

\x20

Question 49

ASCII control character escape example

Answer 49

\cC

Question 50

Unicode hexadecimal character escape example

Answer 50

\u0020

Question 51

Escape character for any character which is not an escaped character

Answer 51

\*

Question 52

Character class for any character except \n

Answer 52

.

Question 53

Character class for any single character in the specified set of characters

Answer 53

[aeiou]

Question 54

Character class for any single character not in the specified set of characters

Answer 54

[^aeiou]

Question 55

Character class for specifying a range of contiguous characters

Answer 55

Hyphen (-) | [0-9a-fA-F]

Question 56

Character class specified by {name} including unicode groups and block ranges

Answer 56

\p{name}

Question 57

Character class specified by {name} excluding those in the named group

Answer 57

\P{name}

Question 58

Character class for any word character

Answer 58

\w

Question 59

Character class for any nonword character

Answer 59

\W

Question 60

Character class for any white-space character

Answer 60

\s

Question 61

Character class for any non-white-space character

Answer 61

\S

Question 62

Character class for any decimal digit

Answer 62

\d

Question 63

Character class for any nondigit

Answer 63

\D