https://bugs.exim.org/show_bug.cgi?id=2325
Philip Hazel <ph10@???> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |INVALID
--- Comment #2 from Philip Hazel <ph10@???> ---
This is not a bug! It is a consequence of the way Perl used to handle backslash
followed by a digit, which is still the case in PCRE1. The documentation in
pcrepattern.3 says this: "Inside a character class, or if the decimal number
following \ is greater than 7 and there have not been that many capturing
subpatterns, PCRE handles \8 and \9 as the literal characters "8" and "9", and
otherwise re-reads up to three octal digits following the backslash, using them
to generate a data character."
Perl has changed from this behaviour, and so has PCRE2, whose documentation
says this: "Outside a character class, PCRE2 reads the digit and any following
digits as a decimal number. If the number is less than 10, begins with the
digit 8 or 9, or if there are at least that many previous capturing left
parentheses in the
expression, the entire sequence is taken as a backreference."
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