parse domain name

# parse main domain from working url

def testDomen(string):
    dp1=0 #dot pos
    dp2=0
    domen=''
    i = 0
    while domen == '':
        if string[i]=='.':
            if dp1==0:
                dp1 = i
                print 'dp1 ', str(dp1)
            elif dp1 != 0 and dp1 != i and dp2 == 0:
                dp2 = i
                print 'dp2 ', str(dp2)
            elif dp2 != 0 and dp2 != i:
                dp1 = dp2
                dp2 = i
                print 'dp1 ', str(dp1), ' dp2 ', str(dp2)
        elif string[i]=='/':
            if dp2 != 0:
                domen = string[dp1+1:i]
            else:
                domen = string[0:i]

            print '<domen>: ', domen, '\n----------------------------'
            break
        i += 1