sourcetype=app_* some_search
| rex "\[(?<transactionid>[A-Za-z0-9]+)\]"
| stats values(*) as * by transactionid
... or, alternately...
sourcetype=app_* some_search
| rex "\[(?<transactionid>[A-Za-z0-9]+)\]"
| transaction transactionid
Removed the extra slash before the final quote.
Added alternate to use transaction .
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