base class for log files regexp builders

 Regexp::Log is a base class for a variety of modules that generate
 regular expressions for performing the usual data munging tasks on log
 files that cannot be simply split().
 .
 The goal of this module family is to compute regular expressions based
 on the configuration string of the log.
 .
 Please note that there is I<nothing useful> you can do with
 Regexp::Log! Use one of its derived classes!