15_Day_Reverse_Vowels_#345.ipynb

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   "source": [
    "class Solution():\n",
    "    def reverse_vowels(self,s):\n",
    "        s = list(s)\n",
    "        l = 0\n",
    "        r = len(s) - 1\n",
    "        vowels = ['a','e','i','o','u']\n",
    "        \n",
    "        while l <= r:\n",
    "            if s[l] in vowels and s[r] in vowels:\n",
    "                s[l],s[r] = s[r],s[l]\n",
    "                l += 1\n",
    "                r -= 1\n",
    "            elif s[r] not in vowels:\n",
    "                r -= 1\n",
    "            elif s[l] not in vowels:\n",
    "                l += 1\n",
    "            else:\n",
    "                l += 1\n",
    "                r -= 1\n",
    "        return ''.join(s)"
   ]
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   "cell_type": "code",
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     "name": "stdout",
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     "text": [
      "leotcede\n"
     ]
    }
   ],
   "source": [
    "s = 'leetcode'\n",
    "ob = Solution()\n",
    "print(ob.reverse_vowels(s))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'leotcede'"
      ]
     },
     "execution_count": 5,
     "metadata": {},
     "output_type": "execute_result"
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   "source": [
    "#Easy code with regex\n",
    "import re\n",
    "def reverseVowels(s):\n",
    "    vowels = re.findall('(?i)[aeiou]', s)\n",
    "    return re.sub('(?i)[aeiou]', lambda m: vowels.pop(), s)\n",
    "reverseVowels('leetcode')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
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