fix: alone [N] interpolation in to option (#375)

Author: evilebottnawi

src/utils/isTemplateLike.js

@@ -1,4 +1,4 @@
 export default (pattern) =>
-  /(\[ext\])|(\[name\])|(\[path\])|(\[folder\])|(\[emoji(?::(\d+))?\])|(\[(?:([^:\]]+):)?(?:hash|contenthash)(?::([a-z]+\d*))?(?::(\d+))?\])/.test(
+  /(\[ext\])|(\[name\])|(\[path\])|(\[folder\])|(\[emoji(?::(\d+))?\])|(\[(?:([^:\]]+):)?(?:hash|contenthash)(?::([a-z]+\d*))?(?::(\d+))?\])|(\[\d+\])/.test(
     pattern
   );

test/CopyPlugin.test.js

@@ -1808,6 +1808,21 @@ describe('apply function', () => {
         .catch(done);
     });
 
+    it('can move multiple files to a non-root directory with [1]', (done) => {
+      runEmit({
+        expectedAssetKeys: ['nested/txt'],
+        patterns: [
+          {
+            from: 'directory/nested/deep-nested',
+            to: 'nested/[1]',
+            test: /\.(.*)$/,
+          },
+        ],
+      })
+        .then(done)
+        .catch(done);
+    });
+
     it("can move a directory's contents to the root directory from symbolic link", (done) => {
       runEmit({
         // Windows doesn't support symbolic link