Regex Flashcards
1
Q
_ (underscore)
A
matches a space
2
Q
A
start of a string
3
Q
$
A
end of a string
4
Q
[ ]
A
matches single character or nesting within a range
5
Q
- (hyphen)
A
indicates a range of numbers in brackets
6
Q
[^]
A
excludes the characters listed in brackets
7
Q
( ) (parenthesis)
A
used for nesting of search patterns
8
Q
(pipe)
A
provides ‘OR’ functionality to the query
9
Q
. (period)
A
matches a single character including a space
10
Q
- (asterisk)
A
matches 0 or more characters or patterns
11
Q
+
A
matches one or more instances of the character or pattern
12
Q
?
A
matches one or no instances of the character or pattern
13
Q
^$
A
Local originating routes
14
Q
permit ^200_
A
Only routes from AS 200
15
Q
permit _200$
A
Only routes originating from AS 200
16
Q
permit 200
A
Only routes that pass through AS 200
17
Q
permit ^[ 0-9] + [0-9] + [0-9] +?
A
Routes with 3 or fewer AS_PATH entries
