Sorry, it actually started working, not sure why but after about 15 minutes the same exact text returned results.
I used the following successfully:
| where NOT match(username,"\d+$")
Thanks again.
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An entry in props.conf can also help reduce the amount of data ingested by Windows events without removing meaningful values:
[WinEventLog:Security]
SEDCMD-remwinstr = s/(?ism)(Token Elevation Type indicates|This event is generated).*$//g
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