validation-box/doc/middleware.ts

The only validation library - with flexible regex - you need.

import { NextResponse } from "next/server";
import type { NextRequest } from "next/server";

export function middleware(request: NextRequest) {
  if (request.nextUrl.pathname === "/") {
    return NextResponse.redirect(new URL("/docs/introduction", request.url)); 
  }

  return NextResponse.next(); 
}

export const config = {
  matcher: "/", 
};