Predefined Characters and Classes
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Character Meaning
a Beep
n Newline character
r Carriage return
t Tab
f Formfeed
e Escape
d Digit (same as [0-9])
D Nondigit character (same as [^0-9])
w Word character (same as [a-zA-Z0-9_])
W Nonword character
s White-space character (same as [ tnrf])
S Non White-space character
xX Hexadecimal digit
cX Matches the corresponding control character
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