fix isHttp

Author: oscarotero

src/functions.php

@@ -63,7 +63,7 @@ function resolveUri(UriInterface $base, UriInterface $uri): UriInterface
 
 function isHttp(string $uri): bool
 {
-    if (preg_match('/^(w+):/', $uri, $matches)) {
+    if (preg_match('/^(\w+):/', $uri, $matches)) {
         return in_array(strtolower($matches[1]), ['http', 'https']);
     }
 

tests/FunctionsTest.php

@@ -0,0 +1,35 @@
+<?php
+declare(strict_types = 1);
+
+namespace Embed\Tests;
+
+use function Embed\isHttp;
+use PHPUnit\Framework\TestCase;
+
+class FunctionsTest extends TestCase
+{
+    public function urlsProvider(): array
+    {
+        return [
+            ['https://foo.com', true],
+            ['http://foo.com', true],
+            ['mailto:foo@example.com', false],
+            ['tel:+1234567890', false],
+            ['data:foo', false],
+            ['./foo', true],
+            ['/foo', true],
+            ['../foo', true],
+            ['foo.com', true],
+            ['//foo.com', true],
+        ];
+    }
+
+    /**
+     * @dataProvider urlsProvider
+     */
+    public function testIsHttp(string $url, bool $expected)
+    {
+        $result = isHttp($url);
+        $this->assertSame($expected, $result);
+    }
+}