I understand that you were just giving an example, but it looks like gratuitous chaining to me. Why not just 
for (@w) {
  s/er/aler/g;
  print "$_\n";
}

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You might also be interested in Algorithm::Loops 'filter'.
Caution: Contents may have been coded under pressure.

In reply to Re^2: Perl oddities (s/// doesn't DWIM in map) by Roy Johnson
in thread Perl oddities by brian_d_foy

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