use warnings;
use strict;
use YAPE::Regex::Explain;
my $re = '(?<!9759-222)(\w\- {24})';
my $parser = YAPE::Regex::Explain->new($re);
print $parser->explain();

__END__

The regular expression:

(?-imsx:(?<!9759-222)(\w\- {24}))

matches as follows:
  
NODE                     EXPLANATION
----------------------------------------------------------------------
(?-imsx:                 group, but do not capture (case-sensitive)
                         (with ^ and $ matching normally) (with . not
                         matching \n) (matching whitespace and #
                         normally):
----------------------------------------------------------------------
  (?<!                     look behind to see if there is not:
----------------------------------------------------------------------
    9759-222                 '9759-222'
----------------------------------------------------------------------
  )                        end of look-behind
----------------------------------------------------------------------
  (                        group and capture to \1:
----------------------------------------------------------------------
    \w                       word characters (a-z, A-Z, 0-9, _)
----------------------------------------------------------------------
    \-                       '-'
----------------------------------------------------------------------
     {24}                    ' ' (24 times)
----------------------------------------------------------------------
  )                        end of \1
----------------------------------------------------------------------
)                        end of grouping
----------------------------------------------------------------------