|There's more than one way to do things|
Re^4: How to use __DATA__ efficiently, help!by Anonyrnous Monk (Hermit)
|on Feb 09, 2011 at 20:02 UTC||Need Help??|
You probably meant
or just (as $_ is the default anyway)
s/// returns the number of substitutions made, so as you have it, you're appending that number to $_.