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use strict;
use warnings;
...
    $$name=$q->param($name);
    #print $name, ': ', $$name, '<BR>';
}

<FORM METHOD=POST ACTION="http://mydomain.com/cgi-bin/search.cgi">
<INPUT TYPE='text' name='a'>
...
<INPUT TYPE='text' name='!'>
<INPUT TYPE='text' name='_'>
</FORM>