Task: Extract URL from an email address

n8n workflow JSON:
{"nodes":[{"name":"On clicking 'execute'","type":"n8n-nodes-base.manualTrigger","position":[240,300],"parameters":{},"typeVersion":1},{"name":"Extract domain name","type":"n8n-nodes-base.function","position":[700,300],"parameters":{"functionCode":"// Take email and extract the domain name \nvar email = ($json[\"email\"]);\nvar name   = email.substring(0, email.lastIndexOf(\"@\"));\nvar domain = email.substring(email.lastIndexOf(\"@\") +1);\n\n//To display the final domain name. (result)\n\nreturn [{\n  json: { domain }\n}]"},"typeVersion":1},{"name":"Sample email","type":"n8n-nodes-base.set","position":[460,300],"parameters":{"values":{"string":[{"name":"email","value":"email@domain2.com"}]},"options":{},"keepOnlySet":true},"typeVersion":1}],"connections":{"Sample email":{"main":[[{"node":"Extract domain name","type":"main","index":0}]]},"On clicking 'execute'":{"main":[[{"node":"Sample email","type":"main","index":0}]]}}}