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  1. or download this
    $complex_re = /^($ip) ($host) ($msg)$/ if (
        $ip   = /\d+\.\d+\.\d+\.\d+/,
        $host = /[\-\.\w]+/,
        $msg  = /.*/
    );
    
  2. or download this
    my $complex_re = eval {
        my $ip   = qr/\d+\.\d+\.\d+\.\d+/;
    ...
    
        return /^($ip) ($host) ($msg)$/;
    );
    
  3. or download this
                     Rate    with eval without eval
    with eval    116279/s           --          -5%
    without eval 121951/s           5%           --