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node_modules/express-validator/docs/feature-wildcards.md

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+---
+id: wildcards
+title: Wildcards
+---
+
+Sometimes you will want to apply the same rules to all items of an array or all keys of some object.  
+That's what the `*` character - also known as a wildcard -- is for.
+
+For example, imagine you want to validate that all addresses have a valid postal code,
+and that the number of each address is sanitized as an integer number.
+
+We can do this with the following code:
+
+```js
+const express = require('express');
+const { check, sanitize } = require('express-validator');
+
+const app = express();
+app.use(express.json());
+
+app.post('/addresses', [
+  check('addresses.*.postalCode').isPostalCode(),
+  sanitize('addresses.*.number').toInt()
+], (req, res) => {
+  // Handle the request
+});
+```
+
+This will handle cases where you send an array of addresses:
+```json
+{
+  "addresses": [
+    { "postalCode": "2010", "number": "500" },
+    { "postalCode": "", "number": "501" },
+  ]
+}
+```
+
+...or even cases where you want a predefined set of addresses:
+```json
+{
+  "addresses": {
+    "home": { "postalCode": "", "number": "501" },
+    "work": { "postalCode": "2010", "number": "500" }
+  }
+}
+```