You just need to search through all the parameter names looking for the ones which match you condition. If you're using CGI, you can do something like this. 
my $q = new CGI;
my @hello_param_names = grep {m/hello/} $q->param();

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my name's not Keith, and I'm not reasonable.

In reply to Re: searching parameter names by reasonablekeith
in thread searching parameter names by Anonymous Monk

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