You are looking at the wrong tool in the box. Do not use rex to extract fields from structure data like JSON which your event contains. Instead, extract the JSON object then use tools like spath to extract data fields. | rex "^[^{]+(?<message_body>.+})"
| spath input=message_body
| table *.alias *.responders{}.name Your sample data will give alert.alias entity.alias params.alert.alias params.entity.alias alert.responders{}.name entity.responders{}.name params.alert.responders{}.name params.entity.responders{}.name FL-NS-VPX-INT-1|mobileapist?vnetapis003?8777, FL-NS-VPX-INT-1|mobileapist?vnetapis003?8777, FL-NS-VPX-INT-1|mobileapist?vnetapis003?8777, FL-NS-VPX-INT-1|mobileapist?vnetapis003?8777, Monitoring_Admin Monitoring_Admin Monitoring_Admin Monitoring_Admin Additional pointers: The sample JSON contains 4 different leaf nodes all named alias. There is no inherent logic to say they are all the same. The sample JSON contains 4 different arrays that all contain leaf nodes that are all named name. There is no inherent logic to say they are all the same. What this means is that you need to ask your developer which node you need data from. Lastly, this JSON has a deep structure. If you are only interested in select few nodes, you can also use a JSON function if your server is 8.2 or later. For example, | rex "^[^{]+(?<message_body>.+})"
| eval alias = json_extract(message_body, "alert.alias"),
name = json_extract(message_body, "alert.responders{}.name")
| table alias name The output will be alias name FL-NS-VPX-INT-1|mobileapist?vnetapis003?8777, Monitoring_Admin Here is an emulation of your sample data. Play with it and compare with real data | makeresults
| eval _raw = "[36mINFO[0m[2024-11-13T13:37:23.9114215-05:00] Message body: {\"actionType\":\"custom\",\"customerId\":\"3a1f4387-b87b-4a3a-a568-cc372a86d8e4\",\"ownerDomain\":\"integration\",\"ownerId\":\"8b500163-8476-4b0e-9ef7-2cfdaa272adf\",\"discardScriptResponse\":true,\"sendCallbackToStreamHub\":false,\"requestId\":\"18dcdb1b-14d6-4b10-ad62-3f73acaaef2a\",\"action\":\"Close\",\"productSource\":\"Opsgenie\",\"customerDomain\":\"siteone\",\"integrationName\":\"Opsgenie Edge Connector\",\"integrationId\":\"8b500163-8476-4b0e-9ef7-2cfdaa272adf\",\"customerTransitioningOrConsolidated\":false,\"source\":{\"name\":\"\",\"type\":\"system\"},\"type\":\"oec\",\"receivedAt\":1731523037863,\"ownerId\":\"8b500163-8476-4b0e-9ef7-2cfdaa272adf\",\"params\":{\"type\":\"oec\",\"alertId\":\"913a3db5-7e2a-44f4-a4ff-3002af480c8d-1731522737697\",\"customerId\":\"3a1f4387-b87b-4a3a-a568-cc372a86d8e4\",\"action\":\"Close\",\"integrationId\":\"8b500163-8476-4b0e-9ef7-2cfdaa272adf\",\"integrationName\":\"Opsgenie Edge Connector\",\"integrationType\":\"OEC\",\"customerDomain\":\"siteone\",\"alertDetails\":{\"Raw\":\"\",\"Results Link\":\"https://hostname:8000/app/search/search?q=%7Cloadjob%20scheduler__td26605__search__RMD5e461b39d4ff19795_at_1731522600_38116%20%7C%20head%204%20%7C%20tail%201&earliest=0&latest=now\",\"SuppressClosed\":\"True\",\"TeamsDescription\":\"True\"},\"alertAlias\":\"FL-NS-VPX-INT-1|mobileapist?vnetapis003?8777,\",\"receivedAt\":1731523037863,\"customerConsolidated\":false,\"customerTransitioningOrConsolidated\":false,\"productSource\":\"Opsgenie\",\"source\":{\"name\":\"\",\"type\":\"system\"},\"alert\":{\"alertId\":\"913a3db5-7e2a-44f4-a4ff-3002af480c8d-1731522737697\",\"id\":\"913a3db5-7e2a-44f4-a4ff-3002af480c8d-1731522737697\",\"type\":\"alert\",\"message\":\"[Splunk] Load Balancer Member Status\",\"tags\":[],\"tinyId\":\"14585\",\"entity\":\"\",\"alias\":\"FL-NS-VPX-INT-1|mobileapist?vnetapis003?8777,\",\"createdAt\":1731522737697,\"updatedAt\":1731523038582000000,\"username\":\"System\",\"responders\":[{\"id\":\"f8c9079d-c7bb-4e58-ac83-359cb217a3b5\",\"type\":\"team\",\"name\":\"Monitoring_Admin\"}],\"teams\":[\"f8c9079d-c7bb-4e58-ac83-359cb217a3b5\"],\"actions\":[],\"priority\":\"P3\",\"oldPriority\":\"P3\",\"source\":\"Splunk\"},\"entity\":{\"alertId\":\"913a3db5-7e2a-44f4-a4ff-3002af480c8d-1731522737697\",\"id\":\"913a3db5-7e2a-44f4-a4ff-3002af480c8d-1731522737697\",\"type\":\"alert\",\"message\":\"[Splunk] Load Balancer Member Status\",\"tags\":[],\"tinyId\":\"14585\",\"entity\":\"\",\"alias\":\"FL-NS-VPX-INT-1|mobileapist?vnetapis003?8777,\",\"createdAt\":1731522737697,\"updatedAt\":1731523038582000000,\"username\":\"System\",\"responders\":[{\"id\":\"f8c9079d-c7bb-4e58-ac83-359cb217a3b5\",\"type\":\"team\",\"name\":\"Monitoring_Admin\"}],\"teams\":[\"f8c9079d-c7bb-4e58-ac83-359cb217a3b5\"],\"actions\":[],\"priority\":\"P3\",\"oldPriority\":\"P3\",\"source\":\"Splunk\"},\"mappedActionDto\":{\"mappedAction\":\"postActionToOEC\",\"extraField\":\"\"},\"ownerId\":\"8b500163-8476-4b0e-9ef7-2cfdaa272adf\"},\"integrationType\":\"OEC\",\"alert\":{\"alertId\":\"913a3db5-7e2a-44f4-a4ff-3002af480c8d-1731522737697\",\"id\":\"913a3db5-7e2a-44f4-a4ff-3002af480c8d-1731522737697\",\"type\":\"alert\",\"message\":\"[Splunk] Load Balancer Member Status\",\"tags\":[],\"tinyId\":\"14585\",\"entity\":\"\",\"alias\":\"FL-NS-VPX-INT-1|mobileapist?vnetapis003?8777,\",\"createdAt\":1731522737697,\"updatedAt\":1731523038582000000,\"username\":\"System\",\"responders\":[{\"id\":\"f8c9079d-c7bb-4e58-ac83-359cb217a3b5\",\"type\":\"team\",\"name\":\"Monitoring_Admin\"}],\"teams\":[\"f8c9079d-c7bb-4e58-ac83-359cb217a3b5\"],\"actions\":[],\"priority\":\"P3\",\"oldPriority\":\"P3\",\"source\":\"Splunk\"},\"customerConsolidated\":false,\"customerId\":\"3a1f4387-b87b-4a3a-a568-cc372a86d8e4\",\"action\":\"Close\",\"mappedActionDto\":{\"mappedAction\":\"postActionToOEC\",\"extraField\":\"\"},\"alertId\":\"913a3db5-7e2a-44f4-a4ff-3002af480c8d-1731522737697\",\"alertAlias\":\"FL-NS-VPX-INT-1|mobileapist?vnetapis003?8777,\",\"alertDetails\":{\"Raw\":\"\",\"Results Link\":\"https://hostname:8000/app/search/search?q=%7Cloadjob%20scheduler__td26605__search__RMD5e461b39d4ff19795_at_1731522600_38116%20%7C%20head%204%20%7C%20tail%201&earliest=0&latest=now\",\"SuppressClosed\":\"True\",\"TeamsDescription\":\"True\"},\"entity\":{\"alertId\":\"913a3db5-7e2a-44f4-a4ff-3002af480c8d-1731522737697\",\"id\":\"913a3db5-7e2a-44f4-a4ff-3002af480c8d-1731522737697\",\"type\":\"alert\",\"message\":\"[Splunk] Load Balancer Member Status\",\"tags\":[],\"tinyId\":\"14585\",\"entity\":\"\",\"alias\":\"FL-NS-VPX-INT-1|mobileapist?vnetapis003?8777,\",\"createdAt\":1731522737697,\"updatedAt\":1731523038582000000,\"username\":\"System\",\"responders\":[{\"id\":\"f8c9079d-c7bb-4e58-ac83-359cb217a3b5\",\"type\":\"team\",\"name\":\"Monitoring_Admin\"}],\"teams\":[\"f8c9079d-c7bb-4e58-ac83-359cb217a3b5\"],\"actions\":[],\"priority\":\"P3\",\"oldPriority\":\"P3\",\"source\":\"Splunk\"}} [36mmessageId[0m=7546739e-2bab-414d-94b5-b0f205208932"
``` data emulation above ```
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