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Perl Language Reference Manual
by Larry Wall and others
Paperback (6"x9"), 724 pages
ISBN 9781906966027
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12.3.4 Octal escapes

Octal escapes consist of a backslash followed by two or three octal digits matching the code point of the character you want to use. This allows for 512 characters (\00 up to \777) that can be expressed this way (but anything above \377 is deprecated). Enough in pre-Unicode days, but most Unicode characters cannot be escaped this way.

Note that a character that is expressed as an octal escape is considered as a character without special meaning by the regex engine, and will match "as is".

ISBN 9781906966027Perl Language Reference ManualSee the print edition