Test for updated base 64 regex
Test for updated base 64 regex

Confirm that non-base 64 alphabet characters are correctly stripped out.
feross/buffer,beni55/buffer,nolanlawson/buffer,btd/buffer,beni55/buffer,LiuDeng/buffer,feross/buffer,loon3/buffer,LinusU/buffer,loon3/buffer,nolanlawson/buffer,SAGV/buffer,kawanet/buffer,LinusU/buffer,kawanet/buffer,LiuDeng/buffer,btd/buffer,SAGV/buffer,feross/buffer