Unlike the OP's version, your version won't handle blank lines or lines other than TABLE and COLUMN properly. If that's acceptable, then the following is even shorter: 
perl -nle "/TABLE;(.*)/?($t=$1):/;(.*);/&&print qq($t.$1)" o33.txt

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In reply to Re^3: regular expression to get the tablename.column_name by ikegami
in thread regular expression to get the tablename.column_name by greatshots

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