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14 Cards in this Set

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  • Back
\w
letter of digit; same as [0-9A-Za-z]
\W
neither letter or digit
\s
space character; same as [ \t\n\r\f]
\S
non-space character
\d
digit character; same as [0-9]
\D
non-digit character
\b (only if in a range specification)
backspace
\b (if not in a range specification)
word boundary
*
zero or more repetitions of preceding
+
one or more repetitions of the preceding
{m, n}
at least m and at most n repetitions of the preceding
?
at most one repetition of the preceding; same as {0, 1}
|
either preceding or next expression may match
()
grouping