CareerCup

is there nay more info on this problem?
1. you could 'ping' each entry in the array and return ones that succeeded (ie are valid)
2. you could specify a pattern to check each entry against (ie can't have characters other than '.', only numbers 0-9 etc)

a = [10,50,652,842,23,95,65,21,777,852,95,21,3,1,5,5,5,1000]
i=0
l = []
while i < len(a)-3:
    if a[i] < 256 and a[i+1] < 256 and a[i+2] < 256 and a[i+3] < 256 :
        l.append([a[i],a[i+1],a[i+2],a[i+3]])
        i = i+3
    else:
        i = i+1
print l

Using this pattern:

^([01]?\\d\\d?|2[0-4]\\d|25[0-5])\\.([01]?\\d\\d?|2[0-4]\\d|25[0-5])\\.
([01]?\\d\\d?|2[0-4]\\d|25[0-5])\\.([01]?\\d\\d?|2[0-4]\\d|25[0-5])$