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#!/usr/bin/env perl

...
21112,/vol/voly,blx
21113,/vol/eng,blz
21114,/vol/eng,file

Initial line:       21112,/vol/voly,blx
Negated class:      21112,/vol/volyblx
...
Negated class:      21114,/vol/engfile
Negative assertion: 21114,/vol/engfile
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W,X,Y,Z
W,X,YZ
W,XYZ
WXYZ

Initial line:       W,X,Y,Z
Negated class:      W,X,YZ
...
Negated class:      WXYZ
Negative assertion: WXYZ
----------------------------------------