[pcre-dev] Compile error "number is too big" ?

Someone sent me the following -- turns out everything in the pattern
from the double quote on was erroneously tacked on (in fact the
"pattern" was even longer.). But I don't understand the error. Don't the
digits after \ddd stand for themselves? If the pattern is one digit
character shorter there is no error. If longer (more digits), the
reported offset of the error gets bigger.

Regards,
Sheri (running 7.7 original release)

pcretest
PCRE version 7.7 2008-05-07

re> /.*?[0-9].log_old.log"D:\Temp\WswTest\WswSOL_0000-log\12006021523/i
Failed: number is too big at offset 63
re>