Initial commit: Developer Tools MVP with visual editor

- Complete React app with 7 developer tools
- JSON Tool with visual structured editor
- Serialize Tool with visual structured editor
- URL, Base64, CSV/JSON, Beautifier, Diff tools
- Responsive navigation with dropdown menu
- Dark/light mode toggle
- Mobile-responsive design with sticky header
- All tools working with copy/paste functionality

node_modules/regex-parser/lib/index.js

@@ -0,0 +1,34 @@
+"use strict";
+
+/**
+ * RegexParser
+ * Parses a string input.
+ *
+ * @name RegexParser
+ * @function
+ * @param {String} input The string input that should be parsed as regular
+ * expression.
+ * @return {RegExp} The parsed regular expression.
+ */
+var RegexParser = module.exports = function (input) {
+    // Validate input
+    if (typeof input !== "string") {
+        throw new Error("Invalid input. Input must be a string");
+    }
+
+    // Parse input
+    var m = input.match(/(\/?)(.+)\1([a-z]*)/i);
+
+    // If there's no match, throw an error
+    if (!m) {
+        throw new Error("Invalid regular expression format.");
+    }
+
+    // Filter valid flags: 'g', 'i', 'm', 's', 'u', and 'y'
+    var validFlags = Array.from(new Set(m[3])).filter(function (flag) {
+        return "gimsuy".includes(flag);
+    }).join("");
+
+    // Create the regular expression
+    return new RegExp(m[2], validFlags);
+};

node_modules/regex-parser/lib/typings/regex-parser.d.ts

@@ -0,0 +1,5 @@
+declare module 'regex-parser' {
+	function Parse(regexString: string): RegExp;
+
+	export = Parse;
+}