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How to convert a working rex statement to a field extraction?

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Sample data: 12/28/2015 11:39:14.113 -0600 collection="MSMQ Queue" object="MSMQ Queue" counter="Messages in Queue" instance="hostname"\private$\test_test_1062 Value=4 I have a working rex that extracts `test_test_1062` to the following: queueName=test_test_1062 using this rex: | rex field=instance \\\(?[^\\]+)$\" If I try to convert this to a field extraction, I get the following error message Encountered the following error while trying to update: In handler 'props-extract': Regex: unmatched parentheses If I remove a slash from each group of slashes then I can save the field extraction, but then the result is not accurate and the last line is captured so I get this queueName=test_test_1062 Value=4 The instance field has several variations, so I cannot get the IFX to work correctly once I load all the variations into it. Basically I just need all the text after `private$` until a white space occurs, but I cannot figure out how to make that happen and also work as a field extraction. Thanks!

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