New Regtest Wallet?

Hello everyone, I am just beginning the bitcoin programming. I have mined the 101 blocks which gave me a TX but then mined another 100. So I have way too many. Is there a way to start over and take it back to Zero??!

Under Linux its enough to stop the bitcoind, then find the .bitcoin folder in your home directory and remove the folder called regtest below it.
It contains everything like the blocks but also your wallet.
Then start bitcoind again with the -regtest parameter. It will recreate the folder including a new wallet.

I hope that helps.
cheers