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Character Escapes Description
Ordinary characters Characters other than .$^{[(|)*+?\ match themselves.
\b Matches a backspace.
\t Matches a tab.
\r Matches a carriage return.
\v Matches a vertical tab.
\f Matches a form feed.
\n Matches a newline.
\ If followed by a special character (one of .$^{[(|)*+?\),
this character escape matches that character literal.
For example, \+ matches the + character.
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