complately update relative path regexp

package.json

@@ -40,7 +40,7 @@
     "chai": "^4.1.2",
     "jest-snapshot": "^23.6.0",
     "mocha": "^5.2.0",
-    "puppeteer": "^1.9.0",
+    "puppeteer": "^1.10.0",
     "rollup": "^0.66.4",
     "rollup-plugin-terser": "^3.0.0",
     "rollup-plugin-typescript": "^1.0.0",

src/snapshot.ts

@@ -43,9 +43,10 @@ function extractOrigin(url: string): string {
 }
 
 const URL_IN_CSS_REF = /url\((['"]|)([^'"]*)\1\)/gm;
+const RELATIVE_PATH = /^(?!www\.|(?:http|ftp)s?:\/\/|[A-Za-z]:\\|\/\/).*/;
 export function absoluteToStylesheet(cssText: string, href: string): string {
   return cssText.replace(URL_IN_CSS_REF, (_1, _2, filePath) => {
-    if (!/^[./]/.test(filePath)) {
+    if (!RELATIVE_PATH.test(filePath)) {
       return `url('${filePath}')`;
     }
     if (filePath[0] === '/') {

test/snapshot.test.ts

@@ -5,6 +5,12 @@ import { absoluteToStylesheet } from '../src/snapshot';
 describe('absolute url to stylesheet', () => {
   const href = 'http://localhost/css/style.css';
 
+  it('cam handle relative path', () => {
+    expect(absoluteToStylesheet('url(a.jpg)', href)).to.equal(
+      `url('http://localhost/css/a.jpg')`,
+    );
+  });
+
   it('can handle same level path', () => {
     expect(absoluteToStylesheet('url("./a.jpg")', href)).to.equal(
       `url('http://localhost/css/a.jpg')`,