Task: Use REGEX to select date

n8n workflow JSON:
{"nodes":[{"name":"On clicking 'execute'","type":"n8n-nodes-base.manualTrigger","position":[250,300],"parameters":{},"typeVersion":1},{"name":"Check for Close Date","type":"n8n-nodes-base.if","position":[660,300],"parameters":{"conditions":{"string":[{"value1":"={{$json[\"Close Date\"]}}","value2":"/\\d\\d\\d\\d-\\d\\d-\\d\\d/i","operation":"regex"}]},"combineOperation":"any"},"typeVersion":1},{"name":"Set Close Date 3 Weeks Later","type":"n8n-nodes-base.set","position":[910,370],"parameters":{"values":{"string":[{"name":"Close Date","value":"={{new Date(new Date().setDate(new Date().getDate() + 21)).toISOString()}}"}]},"options":{},"keepOnlySet":true},"typeVersion":1},{"name":"NoOp","type":"n8n-nodes-base.noOp","position":[1140,280],"parameters":{},"typeVersion":1},{"name":"Set Close Date","type":"n8n-nodes-base.set","position":[450,300],"parameters":{"values":{"string":[{"name":"Close Date","value":"2021-11-29T00:00:00.000Z"}]},"options":{}},"typeVersion":1},{"name":"Set Close Date To Original","type":"n8n-nodes-base.set","position":[910,210],"parameters":{"values":{"string":[{"name":"Close Date","value":"={{$node[\"Set Close Date\"].json[\"Close Date\"]}}"}]},"options":{},"keepOnlySet":true},"typeVersion":1}],"connections":{"Set Close Date":{"main":[[{"node":"Check for Close Date","type":"main","index":0}]]},"Check for Close Date":{"main":[[{"node":"Set Close Date To Original","type":"main","index":0}],[{"node":"Set Close Date 3 Weeks Later","type":"main","index":0}]]},"On clicking 'execute'":{"main":[[{"node":"Set Close Date","type":"main","index":0}]]},"Set Close Date To Original":{"main":[[{"node":"NoOp","type":"main","index":0}]]},"Set Close Date 3 Weeks Later":{"main":[[{"node":"NoOp","type":"main","index":0}]]}}}