Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
22 Cards in this Set
- Front
- Back
|
\b
|
Word boundary
|
|
|
\B
|
Word nonboundary
|
|
|
\d
|
Numeral 0 through 9
|
|
|
\D
|
Non-numeral
|
|
|
\s
|
Single white space
|
|
|
\S
|
Single nonwhite space
|
|
|
\w
|
Letter, numeral or underscore
|
|
|
\W
|
Not letter, numeral or underscore
|
|
|
.
|
Any character except newline
|
|
|
[...]
|
Character set
|
|
|
[^...]
|
Negated character set
|
|
|
*
|
Last character occurring zero or more times
|
|
|
?
|
Last character occurring zero or one time
|
|
|
+
|
Last character occurring one or more times
|
|
|
{n}
|
Last character occurring exactly n times
|
|
|
{n,}
|
Last character occurring n or more times
|
|
|
{n,m}
|
Last character occurring at least n, at most m times
|
|
|
^
|
Pattern occurring at the beginning of the string
|
|
|
$
|
Character occurring at the end of the string
|
|
|
g
|
All occurrences of the pattern; that is, (g)lobal
|
|
|
i
|
Case (i)nsensitive occurrences of the pattern
|
|
|
|
|
OR operator
|
