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    "https://leetcode.com/problems/restore-ip-addresses\n",
    "\n",
    "\n",
    "Runtime: 48 ms, faster than 34.87% of Python3 online submissions for Restore IP Addresses.\n",
    "Memory Usage: 14.2 MB, less than 65.76% of Python3 online submissions for Restore IP Addresses.\n",
    "\n",
    "\n",
    "```python\n",
    "import re\n",
    "from itertools import combinations\n",
    "\n",
    "class Solution:\n",
    "    def restoreIpAddresses(self, s: str) -> List[str]:\n",
    "        #9:37\n",
    "        def isIpValid(ip):\n",
    "            check = re.match(r'^(?:[0-9]{1,3}\\.){3}[0-9]{1,3}$', ip)\n",
    "            if check:\n",
    "                return True\n",
    "            else:\n",
    "                return False\n",
    "        \n",
    "        theResult = []\n",
    "        theIndexRange = range(0, len(s)+1)\n",
    "        for oneWay in combinations(theIndexRange, 4):\n",
    "            a,b,c,d = oneWay\n",
    "            if d == len(s):\n",
    "                parts = [s[:a], s[a:b], s[b:c], s[c:d]]\n",
    "                tempIP = \".\".join(parts)\n",
    "                if isIpValid(tempIP):\n",
    "                    if all([int(i)<=255 and not (len(i) > 1 and i[0] == \"0\") for i in parts]):\n",
    "                        #print(oneWay, tempIP)\n",
    "                        theResult.append(tempIP)\n",
    "        return theResult\n",
    "        #9:49\n",
    "        #debug until 9:59\n",
    "```"
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