This is mostly for my own reference, but I'm sure others on the Interwebs might find this useful as well.
If, per chance, you find yourself pasting a large amount of code into Visual Studio that, for whatever reason, has line numbers included in the copied data, one can easily remove the line number's using Visual Studio's Find & Replace with the "Use Regular Expressions" option...
The trick, obviously is the RegEx, which is: ^ *:d+\:
Make sure the Match case and Match whole word options are disabled and that the Replace with text box is empty, and you're good to go!