Add solution #468

Author: JoshCrozier

README.md

@@ -375,6 +375,7 @@
 464|[Can I Win](./0464-can-i-win.js)|Medium|
 466|[Count The Repetitions](./0466-count-the-repetitions.js)|Hard|
 467|[Unique Substrings in Wraparound String](./0467-unique-substrings-in-wraparound-string.js)|Medium|
+468|[Validate IP Address](./0468-validate-ip-address.js)|Medium|
 472|[Concatenated Words](./0472-concatenated-words.js)|Hard|
 476|[Number Complement](./0476-number-complement.js)|Easy|
 482|[License Key Formatting](./0482-license-key-formatting.js)|Easy|

solutions/0468-validate-ip-address.js

@@ -0,0 +1,33 @@
+/**
+ * 468. Validate IP Address
+ * https://leetcode.com/problems/validate-ip-address/
+ * Difficulty: Medium
+ *
+ * Given a string queryIP, return "IPv4" if IP is a valid IPv4 address, "IPv6" if IP is a valid
+ * IPv6 address or "Neither" if IP is not a correct IP of any type.
+ *
+ * A valid IPv4 address is an IP in the form "x1.x2.x3.x4" where 0 <= xi <= 255 and xi cannot
+ * contain leading zeros. For example, "192.168.1.1" and "192.168.1.0" are valid IPv4 addresses
+ * while "192.168.01.1", "192.168.1.00", and "[email protected]" are invalid IPv4 addresses.
+ *
+ * A valid IPv6 address is an IP in the form "x1:x2:x3:x4:x5:x6:x7:x8" where:
+ * - 1 <= xi.length <= 4
+ * - xi is a hexadecimal string which may contain digits, lowercase English letter ('a' to 'f')
+ *   and upper-case English letters ('A' to 'F').
+ * - Leading zeros are allowed in xi.
+ *
+ * For example, "2001:0db8:85a3:0000:0000:8a2e:0370:7334" and "2001:db8:85a3:0:0:8A2E:0370:7334"
+ * are valid IPv6 addresses, while "2001:0db8:85a3::8A2E:037j:7334" and
+ * "02001:0db8:85a3:0000:0000:8a2e:0370:7334" are invalid IPv6 addresses.
+ */
+
+/**
+ * @param {string} queryIP
+ * @return {string}
+ */
+var validIPAddress = function(queryIP) {
+  const ipv4 = /^((\d|[1-9]\d|1\d\d|2[0-4]\d|25[0-5])\.){3}(\d|[1-9]\d|1\d\d|2[0-4]\d|25[0-5])$/;
+  const ipv6 = /^([\da-fA-F]{1,4}:){7}[\da-fA-F]{1,4}$/;
+
+  return ipv4.test(queryIP) ? 'IPv4' : ipv6.test(queryIP) ? 'IPv6' : 'Neither';
+};