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MVC::Neaf->route( "/foo/bar" => sub {
    my $request = shift;
    
    $request->param( name => qr/\w+/ ); # undef unless name is 1+ word
+ characters
    $request->path_info(); # oops user input slips through
} );

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MVC::Neaf->route( "/foo/bar" => sub {
    my $request = shift;

    $request->path_components->[0]; # 1+ digits guaranteed
}, path_components => qr/\d+/ );