Why make it more complicated than it needs to be?
#!/usr/bin/perl -w
use strict;
my $in ="20120704 00:05:53.46;CmdTask(0);EV;FBLdxPreAlignment rtn=0, Y
+offset=-4278 ";
#desired: 20120704,00:05:53.46,,,-4278
my ($num, $time, $offset) = $in =~ /\s*(\d+)\s+([\d:.]+).*=([-\d]+)\s*
+$/;
print "$num,$time,,,$offset\n";
__END__
prints:
20120704,00:05:53.46,,,-4278
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