Thanks, Roy!

I'd do this in reverse order, so that you aren't substituting in a space that you're later going to remove. That's just a tiny amount of extra work.
You mean like this? 
  $checks{'data'} =~ s/\s+$//;
  $checks{'data'} =~ s/^\s+//;
  $checks{'data'} =~ s/\s+/ /g;

[download]
Okay so 
$checks{'regex'} ||= $default;

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is the same as 
$checks{'regex'} = $checks{'regex'} ? $checks{'regex'} : $default;

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But what does the following do? 
exists($checks{'regex'}) or $checks{'regex'} = $default;

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In reply to Re: Re: Check user input - reimplementation by kiat
in thread Check user input - reimplementation by kiat

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