Jest: simplify regexes

jest.config.js

@@ -38,12 +38,12 @@ module.exports = {
   'transformIgnorePatterns': [
     // FIXME: react-sticky-box doesn't provide a CJS build, so transform it for now
     // https://github.com/codecks-io/react-sticky-box/issues/79
-    `/node_modules/(?!(react-sticky-box|.+\\.(${ASSET_EXTS})))`,
+    `/node_modules/(?!(react-sticky-box|.+\\.(${ASSET_EXTS})$))`,
     // Ignore node_modules, except static assets
-    // `/node_modules/(?!.+\\.(${ASSET_EXTS}))`,
+    // `/node_modules/(?!.+\\.(${ASSET_EXTS})$)`,
   ],
   'transform': {
     '\\.[jt]sx?$': 'babel-jest',
-    [`.+\\.(${ASSET_EXTS})$`]: '<rootDir>/jest/assetTransformer.js',
+    [`\\.(${ASSET_EXTS})$`]: '<rootDir>/jest/assetTransformer.js',
   },
 };