style(core): beautify reg and add .idea to ignore (#179)

Use `sets` instead of `or` in reg is clearer to be understand.
`.idea` is created by the series of IDE which developed by JetBrains.

Author: army8735

.gitignore

@@ -6,3 +6,4 @@ npm-debug.log
 .DS_Store
 yarn.lock
 test/fixtures/egg/node_modules/egg-core
+.idea

lib/loader/file_loader.js

@@ -153,7 +153,7 @@ class FileLoader {
         // app/service/foo/bar.js => [ 'foo', 'bar' ]
         const properties = getProperties(filepath, this.options);
         // app/service/foo/bar.js => service.foo.bar
-        const pathName = directory.split(/\/|\\/).slice(-1) + '.' + properties.join('.');
+        const pathName = directory.split(/[/\\]/).slice(-1) + '.' + properties.join('.');
         // get exports from the file
         const exports = getExports(fullpath, this.options, pathName);
 

lib/utils/index.js

@@ -75,7 +75,7 @@ module.exports = {
   },
 
   getResolvedFilename(filepath, baseDir) {
-    const reg = /\\|\//g;
+    const reg = /[/\\]/g;
     return filepath.replace(baseDir + path.sep, '').replace(reg, '/');
   },
 };