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Is there a syntax error in my search to extract a field from the source field?

Explorer

I am using the following search to extract a field, named 'JobName", from the field named "source"

index="nlg_test_csv_mfjobs" | rex field=source "SPLUNK\\(?[A-Z0-9]+)*_REPORT.*DETAILS.*\.CSV"

and I get this error:

Error in 'rex' command: Encountered the following error while compiling the regex 'SPLUNK\(?[A-Z0-9]+)*_REPORT.*DETAILS.*\.CSV': Regex: unmatched parentheses

I cannot find where the parenthesis are unmatched, unless they are being affected by the regular expression. The expression works in various online regex testers. I am concerned about some Splunk specific syntax that I may not be taking into account.

thanks.

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Re: Is there a syntax error in my search to extract a field from the source field?

SplunkTrust
SplunkTrust

The right parenthesis needs to be escaped.

SPLUNK\(?[A-Z0-9]+\)*_REPORT.DETAILS..CSV

Depending on the data you are trying to match, one or more of the dots may need to be escaped as well.

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If this reply helps you, an upvote would be appreciated.

View solution in original post

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Re: Is there a syntax error in my search to extract a field from the source field?

Explorer

I am not a regx expert, but "guessed" that something was messing with the parenthesis (based on the error). Ultimately, this worked...

rex field=source "SPLUNK\(?[A-Z0-9]+)_REPORT.DETAILS.*.CSV"

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Re: Is there a syntax error in my search to extract a field from the source field?

Explorer

Note that the string is being modified by the page after I submit. The string here is NOT correct. Let's try this. Note that the real search string does not have the outer quotes.

" rex field=source "SPLUNK\(?[A-Z0-9]+)_REPORT.DETAILS.*.CSV" "

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Re: Is there a syntax error in my search to extract a field from the source field?

SplunkTrust
SplunkTrust

So parens are not literally in your events. Didn't guess that without sample data. The new regex doesn't work in regex101.com, BTW, but that's probably a markup problem. If you put your regexes inside back-tics it won't be messed with by the site.

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If this reply helps you, an upvote would be appreciated.
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Re: Is there a syntax error in my search to extract a field from the source field?

SplunkTrust
SplunkTrust

Give this a try

index="nlg_test_csv_mfjobs" | rex field=source "SPLUNK\\\(?<JobName>[A-Z0-9]+)*_REPORT\.DETAILS\.CSV"
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