I had a need to "float" entries matchable with a regex to the bottom of an array or list, preferably without altering the order of other entries. I played for a while with split and splice, but reached the conclusion that the following works for my purposes...

my @rawentries = (
"1topEndbit",
"2ndbit",
"endBit3",
"4thbit",
"5thbit",
"6OtherEndbit",
"7Bitsecondfromend",
"8Bitoneoffend",
"9Anyoldbit",
);

sub ToTop {
       my $t1 = ($a =~ m/Endbit/i)? 0:1;
       my $t2 = ( $b =~ m/Endbit/i )? 0:1;
       $t1 <=> $t2;
}

sub ToEnd
{
       my $t1 = ($a =~ m/Endbit/i)? 1:0;
       my $t2 = ( $b =~ m/Endbit/i )? 1:0;
       $t1 <=> $t2;
}
my @toendlist = sort ToEnd @rawentries;
my @totoplist = sort ToTop @rawentries;

print (join "\n", @toendlist);
print "\n\n".join ("\n", @totoplist)."\n";

[download]
Two questions arise:

  1. Can this sort usage be relied upon?
  2. Am I missing obvious alternative(s) ?

In reply to Move matched to top, bottom by quinkan

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