while or for loop will work fine but u need to use substitute command for substituting the pattern. 

my $length = scalar @arr;
for (my $i =0; $i <= $length; $i++){
    $arr[$i] =~ s/<pattern>/<pattern to be changed to>/g;
}
 print "@arr";

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In reply to Re^3: Search & Replace in an Array by snape
in thread Search & Replace in an Array by Saved

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