lista = ['01.um', '02.dois', '03.tres']
for(i = 0; i < lista.size(); i++)
lista[i] = lista[i].tokenize('.')[0]
println lista
bGlzdGEgPSBbJzAxLnVtJywgJzAyLmRvaXMnLCAnMDMudHJlcyddCgpmb3IoaSA9IDA7IGkgPCBsaXN0YS5zaXplKCk7IGkrKykKCWxpc3RhW2ldID0gbGlzdGFbaV0udG9rZW5pemUoJy4nKVswXQoJCnByaW50bG4gbGlzdGE=