https://bugs.exim.org/show_bug.cgi?id=1852
Philip Hazel <ph10@???> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |INVALID
--- Comment #1 from Philip Hazel <ph10@???> ---
Yes. Internally it uses 16-bit offsets. However, it is possible to compile PCRE
with 24-bit or even 32-bit offsets, thus allowing for very large patterns. This
is a quote from the "pcrelimits" man page:
The maximum length of a compiled pattern is approximately 64K data
units (bytes for the 8-bit library, 16-bit units for the 16-bit
library, and 32-bit units for the 32-bit library) if PCRE is compiled
with the default internal linkage size, which is 2 bytes for the 8-bit
and 16-bit libraries, and 4 bytes for the 32-bit library. If you want
to process regular expressions that are truly enormous, you can compile
PCRE with an internal linkage size of 3 or 4 (when building the 16-bit
or 32-bit library, 3 is rounded up to 4). See the README file in the
source distribution and the pcrebuild documentation for details. In
these cases the limit is substantially larger. However, the speed of
execution is slower.
There are some other things that might give that error, but the above is most
likely if you are just making a bigger and bigger pattern.
Incidentally, the current release of PCRE1 is 8.39, released not long ago.
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