feat: add ip validation solution

Author: marcode24

codewars/ip-validation/README.md

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+# IP Valitation
+
+## Description
+
+Write an algorithm that will identify valid IPv4 addresses in dot-decimal format. IPs should be considered valid if they consist of four octets, with values between 0 and 255, inclusive.
+
+**Valid inputs examples:**
+
+```txt
+Examples of valid inputs:
+1.2.3.4
+123.45.67.89
+```
+
+**Invalid input examples:**
+
+```txt
+1.2.3
+1.2.3.4.5
+123.456.78.90
+123.045.067.089
+```
+
+**Notes:**
+
+- Leading zeros (e.g. 01.02.03.04) are considered invalid
+- Inputs are guaranteed to be a single string

codewars/ip-validation/solution.js

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+function isValidIP(str) {
+  const regexIP = /^((25[0-5]|(2[0-4]|1\d|[1-9]|)\d)\.?\b){4}$/;
+  return regexIP.test(str);
+}
+
+module.exports = isValidIP;

codewars/ip-validation/solution.test.js

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+const isValidIP = require('./solution');
+
+describe('IP Validation', () => {
+  const testCases = [
+    {
+      input: '0.0.0.0',
+      output: true,
+    },
+    {
+      input: '12.255.56.1',
+      output: true,
+    },
+    {
+      input: '137.255.156.100',
+      output: true,
+    },
+    {
+      input: '',
+      output: false,
+    },
+    {
+      input: 'abc.def.ghi.jkl',
+      output: false,
+    },
+    {
+      input: '123.456.789.0',
+      output: false,
+    },
+    {
+      input: '12.34.56',
+      output: false,
+    },
+    {
+      input: '01.02.03.04',
+      output: false,
+    },
+    {
+      input: '256.1.2.3',
+      output: false,
+    },
+    {
+      input: '1.2.3.4.5',
+      output: false,
+    },
+    {
+      input: '123,45,67,89',
+      output: false,
+    },
+    {
+      input: '1e0.1e1.1e2.2e2',
+      output: false,
+    },
+    {
+      input: ' 1.2.3.4',
+      output: false,
+    },
+    {
+      input: '1.2.3.4 ',
+      output: false,
+    },
+    {
+      input: '12.34.56.-7',
+      output: false,
+    },
+    {
+      input: '1.2.3.4\n',
+      output: false,
+    },
+    {
+      input: '\n1.2.3.4',
+      output: false,
+    },
+  ];
+
+  it('should return a boolean type', () => {
+    expect(typeof isValidIP('0.0.0.0')).toBe('boolean');
+  });
+
+  it.each(testCases)('should return $output', (testCase) => {
+    expect(isValidIP(testCase.input)).toBe(testCase.output);
+  });
+});