You certainly can build a regular expression for that, something along these lines: s/<([^>]+)/>/<\1>not_defined</\1>/g
There may be more work necessary to accommodate attributes, and maybe more.
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This is the output when fillnull is used and piped to table:
RIMP.server.name RIMP.server.version RIMP.server.ip
abc1 123 1.2.3.4
abc2 123 1.2.3.5
not_defined 1.2.3.6
abc4 1.2.3.7
abc5 1.2.3.8
not_defined only populating for one entry and not for all entries..
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