How to index match an array of cells to see if each one will match? [duplicate]

Answer 1

try:

=ARRAYFORMULA(IFNA(VLOOKUP(""&ROW(C1:C), SUBSTITUTE(REGEXREPLACE(TRIM(
 SPLIT(FLATTEN(QUERY(QUERY(SPLIT(FLATTEN(ROW(C1:C)&"♠♣"&IFERROR(TRIM(
 SPLIT(LOWER($C1:$C), " t ", 0, 0))&"♦")), "♣"), 
 "select max(Col2) 
  where Col2 matches '^"&TEXTJOIN("$|^", 1, IF(A1:A="",,LOWER(A1:A)&"♦"))&"$' 
  group by Col2 pivot Col1"),,9^9)), "♠")), "♦$", ), "♦", ","), 2, 0)))

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or shorter (works only with one color):

=INDEX(IFNA(REGEXEXTRACT(C1:C, TEXTJOIN("|", 1, SORT(A1:A, 1, 0)))))