split each line on ; and test if the second element in the list is 3 spaces: 
my @interesting = grep { (split /;/)[1] ne '   ' } <DATA>;
print @interesting;
__DATA__
AAD;   ;CCR;365
TEC;UTF;TDE;450
TRE;   ;FTE;164
TEC;URT;TDE;687
ERT;   ;ETR;567
TEC;UGC;TDE;687

[download]

Output:

TEC;UTF;TDE;450
TEC;URT;TDE;687
TEC;UGC;TDE;687

[download]

Not nearly as much fun as your previous question!

In reply to Re: select elements in a list by FunkyMonk
in thread select elements in a list by steph_bow

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