Perl 6
WITCH hack: Revision 3

Mnemonics

\ "backslash", "escape", "hack" (used to hack around, or escape, special characters.)

When used inside a regular expression

\ in front of any character will change it from a metacharacter to a literal, or visa versa.

Other Uses

\ in front of whitespace creates an unspace which is used to jam spaces in where they don't belong.
\o \c \x and \d used inside an interpolated string introduce literal characters


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