I have the answer already after testing it myself, but I wanted to post this question because I did not see any questions for this specific issue. Here is the proper TRANSFORMS entry with one big capture group with multiple conditions (separated by a pipe):
[chuckXmlHeader]
REGEX = (?m)^(<\?xml|<log>|</log>)
DEST_KEY = queue
FORMAT = nullQueue
If you just want to chuck the XML header because you don't have any other events, then this should work for you:
[chuckXmlHeader]
REGEX = (?m)^(<\?xml)
DEST_KEY = queue
FORMAT = nullQueue
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