Add isNode, randomIpAddress and isRegularExpression (#1526)

* add isNode()

Co-authored-by: Angelos Chalaris <chalarangelo@gmail.com>

snippets/isNode.md

@@ -0,0 +1,21 @@
+---
+title: isNode
+tags: node,intermediate
+---
+
+Determines if the current runtime environment is Node.js.
+
+- Use the `process` global object that provides information about the current Node.js process.
+- Check if `process` is defined and `process.versions`, `process.versions.node` are not `null`.
+
+```js
+const isNode = () =>
+  typeof process !== 'undefined' &&
+  process.versions !== null &&
+  process.versions.node !== null;
+```
+
+```js
+isNode(); // true (Node)
+isNode(); // false (browser)
+```