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#!/usr/bin/perl
use warnings;
...
    print "LENGTH ";
    printf length $token ? "|%d|\n" : "\n", $token;
}

PLAIN |100|     DEFINED |100|   LENGTH |100|
PLAIN |10|      DEFINED |10|    LENGTH |10|
PLAIN |0|       DEFINED |0|     LENGTH |0|
PLAIN |0|       DEFINED         LENGTH 
PLAIN |0|       DEFINED |0|     LENGTH

($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord
}map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,