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Regular Expression
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("msg": "log line I care about")(.*)"xml":.*Envelope>"
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g
Input 1
New
{ "key1": "value1", "key2": "value2", "msg": "log line I do not care about", "key3": "value3", "xml": "<bigxml>.....</bigxml>" } { "key1": "value1", "key2": "value2", "msg": "log line I care about", "key3": "value3", "xml": "\n<Envelope xmlns:soap-env=\"http://schemas.xmlsoap.org/soap/envelope/\"><Header><MessageHeader xmlns:eb=\"http://www.ebxml.org/namespaces/messageHeader\" eb:version=\"1.0\" soap-env:mustUnderstand=\"1\"><From><PartyId eb:type=\"URI\">webservices.sabre.com</PartyId></From><To><PartyId eb:type=\"URI\">getgoing.com</PartyId></To><CPAId>J92H</CPAId><ConversationId>cad0fa32-7bb1-11e7-8370-0e6fe63ee5d0</ConversationId><Service eb:type=\"OTA\">OTA_HotelAvailLLSRQ</Service><Action>OTA_HotelAvailLLSRS</Action><MessageData><MessageId>6180279766982210240</MessageId><Timestamp>2017-08-07T21:18:22</Timestamp><RefToMessageId>eeaea495-7bb5-11e7-8370-0e6fe63ee5d0</RefToMessageId></MessageData></MessageHeader><Security xmlns:wsse=\"http://schemas.xmlsoap.org/ws/2002/12/secext\"><B
Substitution
{ "key1": "value1", "key2": "value2", "msg": "log line I do not care about", "key3": "value3", "xml": "<bigxml>.....</bigxml>" } { "key1": "value1", "key2": "value2", "msg": "log line I care about", "key3": "value3", "xml": "\n<Envelope xmlns:soap-env=\"http://schemas.xmlsoap.org/soap/envelope/\"><Header><MessageHeader xmlns:eb=\"http://www.ebxml.org/namespaces/messageHeader\" eb:version=\"1.0\" soap-env:mustUnderstand=\"1\"><From><PartyId eb:type=\"URI\">webservices.sabre.com</PartyId></From><To><PartyId eb:type=\"URI\">getgoing.com</PartyId></To><CPAId>J92H</CPAId><ConversationId>cad0fa32-7bb1-11e7-8370-0e6fe63ee5d0</ConversationId><Service eb:type=\"OTA\">OTA_HotelAvailLLSRQ</Service><Action>OTA_HotelAvailLLSRS</Action><MessageData><MessageId>6180279766982210240</MessageId><Timestamp>2017-08-07T21:18:22</Timestamp><RefToMessageId>eeaea495-7bb5-11e7-8370-0e6fe63ee5d0</RefToMessageId></MessageData></MessageHeader><Security xmlns:wsse=\"http://schemas.xmlsoap.org/ws/2002/12/secext\"><B