I think that code can be tightened up a bit: 
$profile->{require_some} = {
    foo_fields => [ 1, grep /^foo_\d+$/, $q->param ]
};

[download]
But apart from that I'm afraid this is the best solution available to me. Thanks!

In reply to Re^2: Data::FormValidator, equivalent to "require_some_regexp"? by trammell
in thread Data::FormValidator, equivalent to "require_some_regexp"? by trammell

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