What is the idiomatic way to prompt for y|yes or n|no as well as including a default answer?

Example: 
print "Delete this file?[n]: ";
chomp(my $answer=<STDIN>);
if ($answer=~/^y|yes$/i){
    unlink $file or die $!;
} elsif ($answer=~/^n|no|$/i){
        next;
} else { .....

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While writing this I started to think that this might just be a matter of preference so just in case I'll rephrase the question to what are some examples of better ways to go about doing this task. 
prompt?
accept: y,n,yes,no
default: to one of the above
continue with program flow

[download]
I'm trying to get away from using /^y|yes$/i and making everything else no or n

In reply to prompting a user for input by Anonymous Monk

Title:
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