Hi welcome to the monastery! :)

TIMTOWTDI ...

... e.g. you could adapt this flip-flop solution to your needs.

update

with

• $start flag set by the release-rexex
• $end-flag set by the empty line or End-of-file -> eof
• inside flip-flop-condition parse the field-lines into a hash
• in end-condition print table-line with hash-elements and reset hash

HTH :)