[Rails] Checking parameters

Hi.

I am often checking the same parameters (like param[:page] and
param[:per_page]) in models over and over again (are those in a
specific range ... if not use defaults):
page = !options[:page].blank? && options[:page] =~ /^[0-9]+$/ &&
options[:page].to_i > 0 ? options[:page].to_i : 1
per_page = !options[:per_page].blank? && options[:per_page] =~ /^[0-9]+
$/ && options[:per_page].to_i > 0 && options[:per_page].to_i <= 100 ?
options[:per_page].to_i : 10

How can I make this more DRY and easier to read?

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