All the characters that require a backslash character to be taken literally within a pattern.
Character Description f Form feed n Newline r Carriage return t Tab v Vertical tab / Forward slash (/) \ Backward slash () . Period (.) * Asterisk (*) + Plus (+) ? Question Mark (?) | Horizontal bar (|) ( Left parenthesis ( ) Right parenthesis ) [ Left bracket ([) ] Right bracket (]) { Left curly brace ({) } Right curly brace (}) XXX ASCII character represented by the octal number XXX xHH ASCII character represented by the hexadecimal number HH cX The control character represented by X
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