RegEx Quick

Question 1

Name the 11 metacharacters

Answer 1

^ $ | \ () {} [] ? . * +

Question 2

What do each of the 11 metacharacters do

Answer 2

• hat (signifies beginning)
• signifies the end
• quantifier
• explicitly states single characters
• states the order of things
• represents all things
• makes characters literal
• OR
• zero or one
• zero or more
• one or many of previous expression

Question 3

Difference between [aeiou] and [^aeiou]

Answer 3

One expression extracts any single element in a document that matches any single one of our given characters.

The other expression finds characters that do NOT match a single character in our pattern.

Question 4

What is the acronym that represents 12 different character escapes?

Answer 4

BratS fenD pwv
(people.with.cute.v)

\b \r \a \t sS
\f \e \n dD
pP wW cC v

Question 5

What are the three escaping characters that use numbers?

Answer 5

\x20
\040
\u0020

Question 6

What do the 3 escaping characters with numbers mean?

Answer 6

-

Question 7

What are hyphens and what is a range.

Answer 7

(-) link together a hexadecimal range of options.
These two things are the same:
(abc) and (a-c). The range of characters is a through c.