The regular expressions library used by Amanda was written by Henry
Spencer.  The full library distribution is in the regex-src directory,
as well as its copyright notice and license.

A newer version of this library may be available in the URL
ftp://ftp.zoo.toronto.edu/pub/regex.shar

The one distributed with amanda since 2.4.0b4 is a slightly modified
alpha3.6, released on September 30, 1997.  The differences between the
released library and the one distributed with Amanda can be found in
patches/regex-3.6alpha.patch