This is a hack, but if you check the length of the field and it's too short, prepend a zero: 
while ( length $field2 < 4 ) { $field2  = "0" . $field2; }

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Update
Keep in mind that by doing this you can, for instance, add to $field2, and still keep the leading zero. Since I'm new, at least comment on why this node is bad...

In reply to Re: Cgi Phone Number Problem by LogicalChaos
in thread Cgi Phone Number Problem by Anonymous Monk

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