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  1. or download this
    perl -e "$opts = 'io'; $rex = eval qq(qr/aka/$opts); print 'match' if 
    +'ALAKAIA' =~ $rex"
    
    match
    
  2. or download this
    my $opts = $ARGV[0];
    
    die "never trust user input" unless $opts=~/^[msixpodualn]+$/;
    
    ...