Android Question regex.slpit does not work

I have the follow code
DIM Temp() as string
dim Geniko as string
' mylistfiles is a list with mp4 files of the directory "/mnt/scifi"

For a=0 To MyListFiles.Size-1
geniko=mylistfiles.get(a) ' the first object is "inter.mp4"

temp=regex.split(".",geniko)
' here is the problem It does not recognize the "."
so the temp.lenght=0

any suggestion?

Kalarakis
Creta
Greece