# See: https://regex101.com/r/pIx6E8/9
(?xm)^ # every line
(U\+[[:xdigit:]]{4,6}) # [1]codepoint
\t                     # separator
(k[a-zA-Z0-9_]+)       # [2]field key
\t                     # separator
(.*)                   # [3]field value