The my declaration is messing things up here, as the value you set here is going to be only local to the block and AFTER the print statement, so it's lost.

Try this code:

my $id = 0;
my $positionid;
while ( $id < 50 ) {
   $positionid = sprinft( "REG-RC-%04d", $id++ );
   print "Position ID: $positionid<br />\n";
}
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-----------------------------------------------------
Dr. Michael K. Neylon - mneylon-pm@masemware.com || "You've left the lens cap of your mind on again, Pinky" - The Brain
It's not what you know, but knowing how to find it if you don't know that's important