This works in my search:
rex field=source "\w:\\\[\w]*\\\(?<app_path>[^\\\]*)"
But when I try to define it as a field extraction I get the following error:
Encountered the following error while
trying to save: In handler
'props-extract': Regex: missing
terminating ] for character class
All the parens are clearly balanced... what is going on here?
In the rex
command, you need an extra level of escaping of the string (much like you need an extra level of escaping of characters when you specify regexes on the bash command line). But when you define a field extraction in props directly, you need to just specify the regex without the outer layer of escaping. So your base regex should be simply:
\w:\\[\w]*\\(?<app_path>[^\\]*)
Assuming you're trying to get my_app
out of something like c:\base\my_app\whatever\file.txt
Most likely reason - escaping slashes.
Refer http://answers.splunk.com/answers/26703/extracting-a-field-at-search-time-rex-question.html