[grep] searches arrays or lists.
I don't think so. Do you have any reason to believe grep knows anything about arrays?
>perl -le"@a = qw( a b c d ); @b = grep { push(@a,'!') if !$i++; 1 } @
+a; print @b"
abcd
Contrast with for which does:
>perl -le"@a = qw( a b c d ); for (@a) { push(@a,'!') if !$i++; push @
+b, $_ } print @b"
abcd!
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