merge: Add ValidateUrl in String (TheAlgorithms#856)

* Add ValidateUrl in String

* change regex

* Bug fix

Author: Yatin-kathuria

String/ValidateUrl.js

@@ -0,0 +1,13 @@
+/**
+ * @function ValidateURL
+ * @description validate the URL.
+ * @param {String} url - The input URL string
+ * @return {Boolean}
+ */
+const validateURL = (url) => {
+  const URL_PATTERN = /^(https?:\/\/(?:www\.|(?!www))[^\s.]+\.[^\s]{2,}|www\.[^\s]+\.[^\s]{2,})$/gi
+
+  return URL_PATTERN.test(url)
+}
+
+export { validateURL }

String/test/ValidateUrl.test.js

@@ -0,0 +1,14 @@
+import { validateURL } from '../ValidateUrl'
+
+describe('ValidateUrl', () => {
+  it('expects to return false', () => {
+    expect(validateURL('google')).toEqual(false)
+    expect(validateURL('link: https://www.google.com')).toEqual(false)
+  })
+
+  it('expects to return true', () => {
+    expect(validateURL('http://www.google.com')).toEqual(true)
+    expect(validateURL('https://www.google.com')).toEqual(true)
+    expect(validateURL('www.google.com')).toEqual(true)
+  })
+})